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15x-20=20x-70
We move all terms to the left:
15x-20-(20x-70)=0
We get rid of parentheses
15x-20x+70-20=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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