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8(7+4x)=312
We move all terms to the left:
8(7+4x)-(312)=0
We add all the numbers together, and all the variables
8(4x+7)-312=0
We multiply parentheses
32x+56-312=0
We add all the numbers together, and all the variables
32x-256=0
We move all terms containing x to the left, all other terms to the right
32x=256
x=256/32
x=8
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