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2(10x-90)=10x-80
We move all terms to the left:
2(10x-90)-(10x-80)=0
We multiply parentheses
20x-(10x-80)-180=0
We get rid of parentheses
20x-10x+80-180=0
We add all the numbers together, and all the variables
10x-100=0
We move all terms containing x to the left, all other terms to the right
10x=100
x=100/10
x=10
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