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90=65+5x
We move all terms to the left:
90-(65+5x)=0
We add all the numbers together, and all the variables
-(5x+65)+90=0
We get rid of parentheses
-5x-65+90=0
We add all the numbers together, and all the variables
-5x+25=0
We move all terms containing x to the left, all other terms to the right
-5x=-25
x=-25/-5
x=+5
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