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(x+12)+3x=90
We move all terms to the left:
(x+12)+3x-(90)=0
We add all the numbers together, and all the variables
3x+(x+12)-90=0
We get rid of parentheses
3x+x+12-90=0
We add all the numbers together, and all the variables
4x-78=0
We move all terms containing x to the left, all other terms to the right
4x=78
x=78/4
x=19+1/2
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