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x+12+3x+20=7x+8
We move all terms to the left:
x+12+3x+20-(7x+8)=0
We add all the numbers together, and all the variables
4x-(7x+8)+32=0
We get rid of parentheses
4x-7x-8+32=0
We add all the numbers together, and all the variables
-3x+24=0
We move all terms containing x to the left, all other terms to the right
-3x=-24
x=-24/-3
x=+8
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