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15=-30+5x
We move all terms to the left:
15-(-30+5x)=0
We add all the numbers together, and all the variables
-(5x-30)+15=0
We get rid of parentheses
-5x+30+15=0
We add all the numbers together, and all the variables
-5x+45=0
We move all terms containing x to the left, all other terms to the right
-5x=-45
x=-45/-5
x=+9
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