3(5-2x)=21

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



3(5-2x)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-6x+15-21=0

We add all the numbers together, and all the variables

-6x-6=0

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

-6x=6

x=6/-6

x=-1

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