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0=-7+x/3
We move all terms to the left:
0-(-7+x/3)=0
We add all the numbers together, and all the variables
-(x/3-7)+0=0
We add all the numbers together, and all the variables
-(x/3-7)=0
We get rid of parentheses
-x/3+7=0
We multiply all the terms by the denominator
-x+7*3=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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