(5x+3)+(6-x)=21

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Solution for (5x+3)+(6-x)=21 equation: 



(5x+3)+(6-x)=21

We move all terms to the left:

(5x+3)+(6-x)-(21)=0

We add all the numbers together, and all the variables

(5x+3)+(-1x+6)-21=0

We get rid of parentheses

5x-1x+3+6-21=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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