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5x+8(2x-8)=54
We move all terms to the left:
5x+8(2x-8)-(54)=0
We multiply parentheses
5x+16x-64-54=0
We add all the numbers together, and all the variables
21x-118=0
We move all terms containing x to the left, all other terms to the right
21x=118
x=118/21
x=5+13/21
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