-3(x-40)=21

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Solution for -3(x-40)=21 equation: 



-3(x-40)=21

We move all terms to the left:

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

We multiply parentheses

-3x+120-21=0

We add all the numbers together, and all the variables

-3x+99=0

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

-3x=-99

x=-99/-3

x=+33

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