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4+3(x+3)=12x+20-4x
We move all terms to the left:
4+3(x+3)-(12x+20-4x)=0
We add all the numbers together, and all the variables
3(x+3)-(8x+20)+4=0
We multiply parentheses
3x-(8x+20)+9+4=0
We get rid of parentheses
3x-8x-20+9+4=0
We add all the numbers together, and all the variables
-5x-7=0
We move all terms containing x to the left, all other terms to the right
-5x=7
x=7/-5
x=-1+2/5
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