21+3x=18+x

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Solution for 21+3x=18+x equation: 



21+3x=18+x

We move all terms to the left:

21+3x-(18+x)=0

We add all the numbers together, and all the variables

3x-(x+18)+21=0

We get rid of parentheses

3x-x-18+21=0

We add all the numbers together, and all the variables

2x+3=0

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

2x=-3

x=-3/2

x=-1+1/2

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