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105-x-2x=120+2x
We move all terms to the left:
105-x-2x-(120+2x)=0
We add all the numbers together, and all the variables
-x-2x-(2x+120)+105=0
We add all the numbers together, and all the variables
-3x-(2x+120)+105=0
We get rid of parentheses
-3x-2x-120+105=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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