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-147-7x=78+8x
We move all terms to the left:
-147-7x-(78+8x)=0
We add all the numbers together, and all the variables
-7x-(8x+78)-147=0
We get rid of parentheses
-7x-8x-78-147=0
We add all the numbers together, and all the variables
-15x-225=0
We move all terms containing x to the left, all other terms to the right
-15x=225
x=225/-15
x=-15
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