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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We multiply parentheses

5x-3x-21=0

We add all the numbers together, and all the variables

2x-21=0

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

2x=21

x=21/2

x=10+1/2

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