3x+5x=-21+x

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



3x+5x=-21+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

8x-(x-21)=0

We get rid of parentheses

8x-x+21=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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