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5x+12=3x+20.
We move all terms to the left:
5x+12-(3x+20.)=0
We add all the numbers together, and all the variables
5x-(3x+20)+12=0
We get rid of parentheses
5x-3x-20+12=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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