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(12x+8x)=388
We move all terms to the left:
(12x+8x)-(388)=0
We add all the numbers together, and all the variables
(+20x)-388=0
We get rid of parentheses
20x-388=0
We move all terms containing x to the left, all other terms to the right
20x=388
x=388/20
x=19+2/5
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