-3x+18=-21

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Solution for -3x+18=-21 equation: 



-3x+18=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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