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(2x+12)+(13+3x)=90
We move all terms to the left:
(2x+12)+(13+3x)-(90)=0
We add all the numbers together, and all the variables
(2x+12)+(3x+13)-90=0
We get rid of parentheses
2x+3x+12+13-90=0
We add all the numbers together, and all the variables
5x-65=0
We move all terms containing x to the left, all other terms to the right
5x=65
x=65/5
x=13
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