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90=10x-40+50
We move all terms to the left:
90-(10x-40+50)=0
We add all the numbers together, and all the variables
-(10x+10)+90=0
We get rid of parentheses
-10x-10+90=0
We add all the numbers together, and all the variables
-10x+80=0
We move all terms containing x to the left, all other terms to the right
-10x=-80
x=-80/-10
x=+8
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