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70-2x=90-10x
We move all terms to the left:
70-2x-(90-10x)=0
We add all the numbers together, and all the variables
-2x-(-10x+90)+70=0
We get rid of parentheses
-2x+10x-90+70=0
We add all the numbers together, and all the variables
8x-20=0
We move all terms containing x to the left, all other terms to the right
8x=20
x=20/8
x=2+1/2
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