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-7.5x+10=15x-20
We move all terms to the left:
-7.5x+10-(15x-20)=0
We get rid of parentheses
-7.5x-15x+20+10=0
We add all the numbers together, and all the variables
-22.5x+30=0
We move all terms containing x to the left, all other terms to the right
-22.5x=-30
x=-30/-22.5
x=1+5/15
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