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4x+12=15x+45
We move all terms to the left:
4x+12-(15x+45)=0
We get rid of parentheses
4x-15x-45+12=0
We add all the numbers together, and all the variables
-11x-33=0
We move all terms containing x to the left, all other terms to the right
-11x=33
x=33/-11
x=-3
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