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-7x+5(2x-10)=20
We move all terms to the left:
-7x+5(2x-10)-(20)=0
We multiply parentheses
-7x+10x-50-20=0
We add all the numbers together, and all the variables
3x-70=0
We move all terms containing x to the left, all other terms to the right
3x=70
x=70/3
x=23+1/3
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