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0.5x=0.75x-3
We move all terms to the left:
0.5x-(0.75x-3)=0
We get rid of parentheses
0.5x-0.75x+3=0
We add all the numbers together, and all the variables
-0.25x+3=0
We move all terms containing x to the left, all other terms to the right
-0.25x=-3
x=-3/-0.25
x=+12
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