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5(7x+8)=320
We move all terms to the left:
5(7x+8)-(320)=0
We multiply parentheses
35x+40-320=0
We add all the numbers together, and all the variables
35x-280=0
We move all terms containing x to the left, all other terms to the right
35x=280
x=280/35
x=8
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