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45=15-5x
We move all terms to the left:
45-(15-5x)=0
We add all the numbers together, and all the variables
-(-5x+15)+45=0
We get rid of parentheses
5x-15+45=0
We add all the numbers together, and all the variables
5x+30=0
We move all terms containing x to the left, all other terms to the right
5x=-30
x=-30/5
x=-6
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