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270=15x+45
We move all terms to the left:
270-(15x+45)=0
We get rid of parentheses
-15x-45+270=0
We add all the numbers together, and all the variables
-15x+225=0
We move all terms containing x to the left, all other terms to the right
-15x=-225
x=-225/-15
x=+15
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