-3(x+7)+5x=21

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Solution for -3(x+7)+5x=21 equation: 



-3(x+7)+5x=21

We move all terms to the left:

-3(x+7)+5x-(21)=0

We add all the numbers together, and all the variables

5x-3(x+7)-21=0

We multiply parentheses

5x-3x-21-21=0

We add all the numbers together, and all the variables

2x-42=0

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

2x=42

x=42/2

x=21

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