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20+8(x-7)=100
We move all terms to the left:
20+8(x-7)-(100)=0
We add all the numbers together, and all the variables
8(x-7)-80=0
We multiply parentheses
8x-56-80=0
We add all the numbers together, and all the variables
8x-136=0
We move all terms containing x to the left, all other terms to the right
8x=136
x=136/8
x=17
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