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-120-5x=180-15x
We move all terms to the left:
-120-5x-(180-15x)=0
We add all the numbers together, and all the variables
-5x-(-15x+180)-120=0
We get rid of parentheses
-5x+15x-180-120=0
We add all the numbers together, and all the variables
10x-300=0
We move all terms containing x to the left, all other terms to the right
10x=300
x=300/10
x=30
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