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12-7=0.5x
We move all terms to the left:
12-7-(0.5x)=0
We add all the numbers together, and all the variables
-(+0.5x)+12-7=0
We add all the numbers together, and all the variables
-(+0.5x)+5=0
We get rid of parentheses
-0.5x+5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-5
x=-5/-0.5
x=+10
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