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10x-30=-10x-90
We move all terms to the left:
10x-30-(-10x-90)=0
We get rid of parentheses
10x+10x+90-30=0
We add all the numbers together, and all the variables
20x+60=0
We move all terms containing x to the left, all other terms to the right
20x=-60
x=-60/20
x=-3
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