(x+6)+(4x-21)=0

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Solution for (x+6)+(4x-21)=0 equation: 



(x+6)+(4x-21)=0

We get rid of parentheses

x+4x+6-21=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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