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10.5=x+21/2
We move all terms to the left:
10.5-(x+21/2)=0
We add all the numbers together, and all the variables
-(+x+21/2)+10.5=0
We get rid of parentheses
-x+10.5-21/2=0
We multiply all the terms by the denominator
-x*2-21+(10.5)*2=0
We add all the numbers together, and all the variables
-x*2=0
Wy multiply elements
-2x=0
x=0/-2
x=0
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