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.5x+3=2x-12
We move all terms to the left:
.5x+3-(2x-12)=0
We get rid of parentheses
.5x-2x+12+3=0
We add all the numbers together, and all the variables
-1.5x+15=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-15
x=-15/-1.5
x=+10
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