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2(6x+7x)=15
We move all terms to the left:
2(6x+7x)-(15)=0
We add all the numbers together, and all the variables
2(+13x)-15=0
We multiply parentheses
26x-15=0
We move all terms containing x to the left, all other terms to the right
26x=15
x=15/26
x=15/26
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