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15-4x=8x+45
We move all terms to the left:
15-4x-(8x+45)=0
We get rid of parentheses
-4x-8x-45+15=0
We add all the numbers together, and all the variables
-12x-30=0
We move all terms containing x to the left, all other terms to the right
-12x=30
x=30/-12
x=-2+1/2
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