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-3-(5x-15)=-81
We move all terms to the left:
-3-(5x-15)-(-81)=0
We add all the numbers together, and all the variables
-(5x-15)+78=0
We get rid of parentheses
-5x+15+78=0
We add all the numbers together, and all the variables
-5x+93=0
We move all terms containing x to the left, all other terms to the right
-5x=-93
x=-93/-5
x=18+3/5
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