21+28=2x+5x

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Solution for 21+28=2x+5x equation: 



21+28=2x+5x

We move all terms to the left:

21+28-(2x+5x)=0

We add all the numbers together, and all the variables

-(+7x)+21+28=0

We add all the numbers together, and all the variables

-(+7x)+49=0

We get rid of parentheses

-7x+49=0

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

-7x=-49

x=-49/-7

x=+7

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