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