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4x-42-12x=36+5x
We move all terms to the left:
4x-42-12x-(36+5x)=0
We add all the numbers together, and all the variables
4x-12x-(5x+36)-42=0
We add all the numbers together, and all the variables
-8x-(5x+36)-42=0
We get rid of parentheses
-8x-5x-36-42=0
We add all the numbers together, and all the variables
-13x-78=0
We move all terms containing x to the left, all other terms to the right
-13x=78
x=78/-13
x=-6
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