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-3x+12+4x=5+2x+3
We move all terms to the left:
-3x+12+4x-(5+2x+3)=0
We add all the numbers together, and all the variables
-3x+4x-(2x+8)+12=0
We add all the numbers together, and all the variables
x-(2x+8)+12=0
We get rid of parentheses
x-2x-8+12=0
We add all the numbers together, and all the variables
-1x+4=0
We move all terms containing x to the left, all other terms to the right
-x=-4
x=-4/-1
x=+4
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