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6+91x=30x+42
We move all terms to the left:
6+91x-(30x+42)=0
We get rid of parentheses
91x-30x-42+6=0
We add all the numbers together, and all the variables
61x-36=0
We move all terms containing x to the left, all other terms to the right
61x=36
x=36/61
x=36/61
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