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-15-15x=-4x
We move all terms to the left:
-15-15x-(-4x)=0
We get rid of parentheses
-15x+4x-15=0
We add all the numbers together, and all the variables
-11x-15=0
We move all terms containing x to the left, all other terms to the right
-11x=15
x=15/-11
x=-1+4/11
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