12x-21+21=4x-12x-30

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Solution for 12x-21+21=4x-12x-30 equation: 



12x-21+21=4x-12x-30

We move all terms to the left:

12x-21+21-(4x-12x-30)=0

We add all the numbers together, and all the variables

12x-(-8x-30)-21+21=0

We add all the numbers together, and all the variables

12x-(-8x-30)=0

We get rid of parentheses

12x+8x+30=0

We add all the numbers together, and all the variables

20x+30=0

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

20x=-30

x=-30/20

x=-1+1/2

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