21=3(x)+6

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



21=3(x)+6

We move all terms to the left:

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

We get rid of parentheses

-3x-6+21=0

We add all the numbers together, and all the variables

-3x+15=0

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

-3x=-15

x=-15/-3

x=+5

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