18+2x=3(-x+3)-21

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Solution for 18+2x=3(-x+3)-21 equation: 



18+2x=3(-x+3)-21

We move all terms to the left:

18+2x-(3(-x+3)-21)=0

We add all the numbers together, and all the variables

2x-(3(-1x+3)-21)+18=0



We calculate terms in parentheses: -(3(-1x+3)-21), so:

3(-1x+3)-21

We multiply parentheses

-3x+9-21

We add all the numbers together, and all the variables

-3x-12

Back to the equation:

-(-3x-12)



We get rid of parentheses

2x+3x+12+18=0

We add all the numbers together, and all the variables

5x+30=0

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

5x=-30

x=-30/5

x=-6

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