18x+21=-7

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Solution for 18x+21=-7 equation: 



18x+21=-7

We move all terms to the left:

18x+21-(-7)=0

We add all the numbers together, and all the variables

18x+28=0

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

18x=-28

x=-28/18

x=-1+5/9

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