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-11x-30=42-15x
We move all terms to the left:
-11x-30-(42-15x)=0
We add all the numbers together, and all the variables
-11x-(-15x+42)-30=0
We get rid of parentheses
-11x+15x-42-30=0
We add all the numbers together, and all the variables
4x-72=0
We move all terms containing x to the left, all other terms to the right
4x=72
x=72/4
x=18
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