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3x+12-4-4=-15x+15+42+6x
We move all terms to the left:
3x+12-4-4-(-15x+15+42+6x)=0
We add all the numbers together, and all the variables
3x-(-9x+57)+12-4-4=0
We add all the numbers together, and all the variables
3x-(-9x+57)+4=0
We get rid of parentheses
3x+9x-57+4=0
We add all the numbers together, and all the variables
12x-53=0
We move all terms containing x to the left, all other terms to the right
12x=53
x=53/12
x=4+5/12
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