6x+30=3x+21

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Solution for 6x+30=3x+21 equation: 



6x+30=3x+21

We move all terms to the left:

6x+30-(3x+21)=0

We get rid of parentheses

6x-3x-21+30=0

We add all the numbers together, and all the variables

3x+9=0

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

3x=-9

x=-9/3

x=-3

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