21+3x=12-5x

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Solution for 21+3x=12-5x equation: 



21+3x=12-5x

We move all terms to the left:

21+3x-(12-5x)=0

We add all the numbers together, and all the variables

3x-(-5x+12)+21=0

We get rid of parentheses

3x+5x-12+21=0

We add all the numbers together, and all the variables

8x+9=0

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

8x=-9

x=-9/8

x=-1+1/8

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