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4(3x-x)+7x=4x+12+2x
We move all terms to the left:
4(3x-x)+7x-(4x+12+2x)=0
We add all the numbers together, and all the variables
4(+2x)+7x-(6x+12)=0
We add all the numbers together, and all the variables
7x+4(+2x)-(6x+12)=0
We multiply parentheses
7x+8x-(6x+12)=0
We get rid of parentheses
7x+8x-6x-12=0
We add all the numbers together, and all the variables
9x-12=0
We move all terms containing x to the left, all other terms to the right
9x=12
x=12/9
x=1+1/3
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