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-111-3x=189-15x
We move all terms to the left:
-111-3x-(189-15x)=0
We add all the numbers together, and all the variables
-3x-(-15x+189)-111=0
We get rid of parentheses
-3x+15x-189-111=0
We add all the numbers together, and all the variables
12x-300=0
We move all terms containing x to the left, all other terms to the right
12x=300
x=300/12
x=25
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