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90=50+8x
We move all terms to the left:
90-(50+8x)=0
We add all the numbers together, and all the variables
-(8x+50)+90=0
We get rid of parentheses
-8x-50+90=0
We add all the numbers together, and all the variables
-8x+40=0
We move all terms containing x to the left, all other terms to the right
-8x=-40
x=-40/-8
x=+5
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