12-3(5-2x)=21

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Solution for 12-3(5-2x)=21 equation: 



12-3(5-2x)=21

We move all terms to the left:

12-3(5-2x)-(21)=0

We add all the numbers together, and all the variables

-3(-2x+5)+12-21=0

We add all the numbers together, and all the variables

-3(-2x+5)-9=0

We multiply parentheses

6x-15-9=0

We add all the numbers together, and all the variables

6x-24=0

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

6x=24

x=24/6

x=4

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