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70-x=80-2x
We move all terms to the left:
70-x-(80-2x)=0
We add all the numbers together, and all the variables
-x-(-2x+80)+70=0
We add all the numbers together, and all the variables
-1x-(-2x+80)+70=0
We get rid of parentheses
-1x+2x-80+70=0
We add all the numbers together, and all the variables
x-10=0
We move all terms containing x to the left, all other terms to the right
x=10
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