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4x+(3x+1)=-42+12x
We move all terms to the left:
4x+(3x+1)-(-42+12x)=0
We add all the numbers together, and all the variables
4x+(3x+1)-(12x-42)=0
We get rid of parentheses
4x+3x-12x+1+42=0
We add all the numbers together, and all the variables
-5x+43=0
We move all terms containing x to the left, all other terms to the right
-5x=-43
x=-43/-5
x=8+3/5
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