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(x+12)+5x=90=
We move all terms to the left:
(x+12)+5x-(90)=0
We add all the numbers together, and all the variables
5x+(x+12)-90=0
We get rid of parentheses
5x+x+12-90=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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