21x+30=18x-15

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Solution for 21x+30=18x-15 equation: 



21x+30=18x-15

We move all terms to the left:

21x+30-(18x-15)=0

We get rid of parentheses

21x-18x+15+30=0

We add all the numbers together, and all the variables

3x+45=0

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

3x=-45

x=-45/3

x=-15

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