(6x+9)-16x=-21

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Solution for (6x+9)-16x=-21 equation: 



(6x+9)-16x=-21

We move all terms to the left:

(6x+9)-16x-(-21)=0

We add all the numbers together, and all the variables

-16x+(6x+9)+21=0

We get rid of parentheses

-16x+6x+9+21=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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