21=7x+8-9x+12

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Solution for 21=7x+8-9x+12 equation: 



21=7x+8-9x+12

We move all terms to the left:

21-(7x+8-9x+12)=0

We add all the numbers together, and all the variables

-(-2x+20)+21=0

We get rid of parentheses

2x-20+21=0

We add all the numbers together, and all the variables

2x+1=0

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

2x=-1

x=-1/2

x=-1/2

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