12-3(2x+5)=21

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



12-3(2x+5)=21

We move all terms to the left:

12-3(2x+5)-(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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