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8x+7(4x-1)=78
We move all terms to the left:
8x+7(4x-1)-(78)=0
We multiply parentheses
8x+28x-7-78=0
We add all the numbers together, and all the variables
36x-85=0
We move all terms containing x to the left, all other terms to the right
36x=85
x=85/36
x=2+13/36
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