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10x-3x+84=10x+39
We move all terms to the left:
10x-3x+84-(10x+39)=0
We add all the numbers together, and all the variables
7x-(10x+39)+84=0
We get rid of parentheses
7x-10x-39+84=0
We add all the numbers together, and all the variables
-3x+45=0
We move all terms containing x to the left, all other terms to the right
-3x=-45
x=-45/-3
x=+15
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