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40=300x/30
We move all terms to the left:
40-(300x/30)=0
We add all the numbers together, and all the variables
-(+300x/30)+40=0
We get rid of parentheses
-300x/30+40=0
We multiply all the terms by the denominator
-300x+40*30=0
We add all the numbers together, and all the variables
-300x+1200=0
We move all terms containing x to the left, all other terms to the right
-300x=-1200
x=-1200/-300
x=+4
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