3(4x+5)=21x-9

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Solution for 3(4x+5)=21x-9 equation: 



3(4x+5)=21x-9

We move all terms to the left:

3(4x+5)-(21x-9)=0

We multiply parentheses

12x-(21x-9)+15=0

We get rid of parentheses

12x-21x+9+15=0

We add all the numbers together, and all the variables

-9x+24=0

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

-9x=-24

x=-24/-9

x=2+2/3

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