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x=10.5+.5x
We move all terms to the left:
x-(10.5+.5x)=0
We add all the numbers together, and all the variables
x-(.5x+10.5)=0
We get rid of parentheses
x-.5x-10.5=0
We add all the numbers together, and all the variables
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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