3x+5+6+2x=21

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Solution for 3x+5+6+2x=21 equation: 



3x+5+6+2x=21

We move all terms to the left:

3x+5+6+2x-(21)=0

We add all the numbers together, and all the variables

5x-10=0

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

5x=10

x=10/5

x=2

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