3(x+40)+9=21

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Solution for 3(x+40)+9=21 equation: 



3(x+40)+9=21

We move all terms to the left:

3(x+40)+9-(21)=0

We add all the numbers together, and all the variables

3(x+40)-12=0

We multiply parentheses

3x+120-12=0

We add all the numbers together, and all the variables

3x+108=0

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

3x=-108

x=-108/3

x=-36

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