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5(8x-4)=300
We move all terms to the left:
5(8x-4)-(300)=0
We multiply parentheses
40x-20-300=0
We add all the numbers together, and all the variables
40x-320=0
We move all terms containing x to the left, all other terms to the right
40x=320
x=320/40
x=8
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