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-15=-45+x
We move all terms to the left:
-15-(-45+x)=0
We add all the numbers together, and all the variables
-(x-45)-15=0
We get rid of parentheses
-x+45-15=0
We add all the numbers together, and all the variables
-1x+30=0
We move all terms containing x to the left, all other terms to the right
-x=-30
x=-30/-1
x=+30
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