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(10x+2x)+54=90
We move all terms to the left:
(10x+2x)+54-(90)=0
We add all the numbers together, and all the variables
(+12x)+54-90=0
We add all the numbers together, and all the variables
(+12x)-36=0
We get rid of parentheses
12x-36=0
We move all terms containing x to the left, all other terms to the right
12x=36
x=36/12
x=3
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