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72=-12+4x+6-7x
We move all terms to the left:
72-(-12+4x+6-7x)=0
We add all the numbers together, and all the variables
-(-3x-6)+72=0
We get rid of parentheses
3x+6+72=0
We add all the numbers together, and all the variables
3x+78=0
We move all terms containing x to the left, all other terms to the right
3x=-78
x=-78/3
x=-26
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