(x-4)+(3x+21)=6x-13

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Solution for (x-4)+(3x+21)=6x-13 equation: 



(x-4)+(3x+21)=6x-13

We move all terms to the left:

(x-4)+(3x+21)-(6x-13)=0

We get rid of parentheses

x+3x-6x-4+21+13=0

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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