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40/10=x/30
We move all terms to the left:
40/10-(x/30)=0
We add all the numbers together, and all the variables
-(+x/30)+40/10=0
We add all the numbers together, and all the variables
-(+x/30)+4=0
We get rid of parentheses
-x/30+4=0
We multiply all the terms by the denominator
-x+4*30=0
We add all the numbers together, and all the variables
-1x+120=0
We move all terms containing x to the left, all other terms to the right
-x=-120
x=-120/-1
x=+120
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