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10.5=0.5x
We move all terms to the left:
10.5-(0.5x)=0
We add all the numbers together, and all the variables
-(+0.5x)+10.5=0
We get rid of parentheses
-0.5x+10.5=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-10.5
x=-10.5/-0.5
x=+21
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