21x-42x+9x-12=28x-189-63

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Solution for 21x-42x+9x-12=28x-189-63 equation: 



21x-42x+9x-12=28x-189-63

We move all terms to the left:

21x-42x+9x-12-(28x-189-63)=0

We add all the numbers together, and all the variables

21x-42x+9x-(28x-252)-12=0

We add all the numbers together, and all the variables

-12x-(28x-252)-12=0

We get rid of parentheses

-12x-28x+252-12=0

We add all the numbers together, and all the variables

-40x+240=0

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

-40x=-240

x=-240/-40

x=+6

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