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(13+9+x)/3=10.5
We move all terms to the left:
(13+9+x)/3-(10.5)=0
We add all the numbers together, and all the variables
(x+22)/3-(10.5)=0
We add all the numbers together, and all the variables
(x+22)/3-10.5=0
We multiply all the terms by the denominator
(x+22)-(10.5)*3=0
We add all the numbers together, and all the variables
(x+22)-31.5=0
We get rid of parentheses
x+22-31.5=0
We add all the numbers together, and all the variables
x-9.5=0
We move all terms containing x to the left, all other terms to the right
x=9.5
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