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-15x-195=120+6x
We move all terms to the left:
-15x-195-(120+6x)=0
We add all the numbers together, and all the variables
-15x-(6x+120)-195=0
We get rid of parentheses
-15x-6x-120-195=0
We add all the numbers together, and all the variables
-21x-315=0
We move all terms containing x to the left, all other terms to the right
-21x=315
x=315/-21
x=-15
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