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30=3x/10
We move all terms to the left:
30-(3x/10)=0
We add all the numbers together, and all the variables
-(+3x/10)+30=0
We get rid of parentheses
-3x/10+30=0
We multiply all the terms by the denominator
-3x+30*10=0
We add all the numbers together, and all the variables
-3x+300=0
We move all terms containing x to the left, all other terms to the right
-3x=-300
x=-300/-3
x=+100
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