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12x-4x-15=40+39
We move all terms to the left:
12x-4x-15-(40+39)=0
We add all the numbers together, and all the variables
12x-4x-15-79=0
We add all the numbers together, and all the variables
8x-94=0
We move all terms containing x to the left, all other terms to the right
8x=94
x=94/8
x=11+3/4
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