PROBLEM
Solve for x :
61(x−1)+x=21x=□
STEP 1
1. The equation 61(x−1)+x=21 is a linear equation.
2. The goal is to solve for the variable x.
3. Basic algebraic operations such as distribution, combining like terms, and solving linear equations are required.
STEP 2
1. Distribute the fraction 61 across the terms inside the parentheses.
2. Combine like terms.
3. Isolate the variable x.
4. Verify the solution by substituting it back into the original equation.
STEP 3
Distribute 61 across the terms inside the parentheses:
61(x−1)=61x−61 The equation becomes:
61x−61+x=21
STEP 4
Combine like terms. Notice that 61x and x are like terms:
61x+x=61x+66x=67x The equation now is:
67x−61=21
STEP 5
Isolate the variable x by first eliminating the constant term −61 from the left side. Add 61 to both sides:
67x=21+61 To add the fractions, find a common denominator:
21=63 Thus:
67x=63+61=64 Simplify 64 to 32:
67x=32 Now, solve for x by multiplying both sides by the reciprocal of 67, which is 76:
x=32×76=2112 Simplify 2112 to 74:
x=74
SOLUTION
Verify the solution by substituting x=74 back into the original equation:
Original equation:
61(x−1)+x=21 Substitute x=74:
61(74−1)+74 Calculate 74−1:
74−77=−73 Substitute back:
61(−73)+74=−423+74 Convert 74 to have a denominator of 42:
74=4224 Add the fractions:
−423+4224=4221 Simplify 4221 to 21:
21=21 The left side equals the right side, confirming the solution is correct.
The solution is:
x=74
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