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15-2x=-77x
We move all terms to the left:
15-2x-(-77x)=0
We get rid of parentheses
-2x+77x+15=0
We add all the numbers together, and all the variables
75x+15=0
We move all terms containing x to the left, all other terms to the right
75x=-15
x=-15/75
x=-1/5
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