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65x+21=-15x-34
We move all terms to the left:
65x+21-(-15x-34)=0
We get rid of parentheses
65x+15x+34+21=0
We add all the numbers together, and all the variables
80x+55=0
We move all terms containing x to the left, all other terms to the right
80x=-55
x=-55/80
x=-11/16
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