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6x=91-7x
We move all terms to the left:
6x-(91-7x)=0
We add all the numbers together, and all the variables
6x-(-7x+91)=0
We get rid of parentheses
6x+7x-91=0
We add all the numbers together, and all the variables
13x-91=0
We move all terms containing x to the left, all other terms to the right
13x=91
x=91/13
x=7
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