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3x+22.5=15x+37.5
We move all terms to the left:
3x+22.5-(15x+37.5)=0
We get rid of parentheses
3x-15x-37.5+22.5=0
We add all the numbers together, and all the variables
-12x-15=0
We move all terms containing x to the left, all other terms to the right
-12x=15
x=15/-12
x=-1+1/4
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