-3(5-x)=21

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



-3(5-x)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3(-1x+5)-21=0

We multiply parentheses

3x-15-21=0

We add all the numbers together, and all the variables

3x-36=0

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

3x=36

x=36/3

x=12

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