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3x+4x-15=3x-3(6)
We move all terms to the left:
3x+4x-15-(3x-3(6))=0
We add all the numbers together, and all the variables
7x-(3x-36)-15=0
We get rid of parentheses
7x-3x+36-15=0
We add all the numbers together, and all the variables
4x+21=0
We move all terms containing x to the left, all other terms to the right
4x=-21
x=-21/4
x=-5+1/4
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