21=-3(5x-2)

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Solution for 21=-3(5x-2) equation: 



21=-3(5x-2)

We move all terms to the left:

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



We calculate terms in parentheses: -(-3(5x-2)), so:

-3(5x-2)

We multiply parentheses

-15x+6

Back to the equation:

-(-15x+6)



We get rid of parentheses

15x-6+21=0

We add all the numbers together, and all the variables

15x+15=0

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

15x=-15

x=-15/15

x=-1

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