-10x+21=-9

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Solution for -10x+21=-9 equation: 



-10x+21=-9

We move all terms to the left:

-10x+21-(-9)=0

We add all the numbers together, and all the variables

-10x+30=0

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

-10x=-30

x=-30/-10

x=+3

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