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90=50+4x
We move all terms to the left:
90-(50+4x)=0
We add all the numbers together, and all the variables
-(4x+50)+90=0
We get rid of parentheses
-4x-50+90=0
We add all the numbers together, and all the variables
-4x+40=0
We move all terms containing x to the left, all other terms to the right
-4x=-40
x=-40/-4
x=+10
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