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7x+3(1+6x)=91
We move all terms to the left:
7x+3(1+6x)-(91)=0
We add all the numbers together, and all the variables
7x+3(6x+1)-91=0
We multiply parentheses
7x+18x+3-91=0
We add all the numbers together, and all the variables
25x-88=0
We move all terms containing x to the left, all other terms to the right
25x=88
x=88/25
x=3+13/25
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