-12-(-21)=x/8

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Solution for -12-(-21)=x/8 equation: 



-12-(-21)=x/8

We move all terms to the left:

-12-(-21)-(x/8)=0

We add all the numbers together, and all the variables

-(+x/8)-12-(-21)=0

We add all the numbers together, and all the variables

-(+x/8)+9=0

We get rid of parentheses

-x/8+9=0

We multiply all the terms by the denominator


-x+9*8=0

We add all the numbers together, and all the variables

-1x+72=0

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

-x=-72

x=-72/-1

x=+72

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