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45=15-3x.
We move all terms to the left:
45-(15-3x.)=0
We add all the numbers together, and all the variables
-(-3x.+15)+45=0
We get rid of parentheses
3x.-15+45=0
We add all the numbers together, and all the variables
3x.+30=0
We move all terms containing x to the left, all other terms to the right
3x.=-30
x=-30/1
x=-30
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