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5x+12+3x=36.
We move all terms to the left:
5x+12+3x-(36.)=0
We add all the numbers together, and all the variables
5x+3x+12-36=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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