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90=5x+8x+25
We move all terms to the left:
90-(5x+8x+25)=0
We add all the numbers together, and all the variables
-(13x+25)+90=0
We get rid of parentheses
-13x-25+90=0
We add all the numbers together, and all the variables
-13x+65=0
We move all terms containing x to the left, all other terms to the right
-13x=-65
x=-65/-13
x=+5
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