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8(5+x)=64
We move all terms to the left:
8(5+x)-(64)=0
We add all the numbers together, and all the variables
8(x+5)-64=0
We multiply parentheses
8x+40-64=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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