21x+30=12x+75

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Solution for 21x+30=12x+75 equation: 



21x+30=12x+75

We move all terms to the left:

21x+30-(12x+75)=0

We get rid of parentheses

21x-12x-75+30=0

We add all the numbers together, and all the variables

9x-45=0

We move all terms containing x to the left, all other terms to the right

9x=45

x=45/9

x=5

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