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4x+3-9=-2x-42
We move all terms to the left:
4x+3-9-(-2x-42)=0
We add all the numbers together, and all the variables
4x-(-2x-42)-6=0
We get rid of parentheses
4x+2x+42-6=0
We add all the numbers together, and all the variables
6x+36=0
We move all terms containing x to the left, all other terms to the right
6x=-36
x=-36/6
x=-6
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