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