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6x-91=4x-31
We move all terms to the left:
6x-91-(4x-31)=0
We get rid of parentheses
6x-4x+31-91=0
We add all the numbers together, and all the variables
2x-60=0
We move all terms containing x to the left, all other terms to the right
2x=60
x=60/2
x=30
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