-13x+21x=+12-20

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Solution for -13x+21x=+12-20 equation: 



-13x+21x=+12-20

We move all terms to the left:

-13x+21x-(+12-20)=0

We add all the numbers together, and all the variables

-13x+21x-(-8)=0

We add all the numbers together, and all the variables

8x+8=0

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

8x=-8

x=-8/8

x=-1

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