-8x+21=-5x+12

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Solution for -8x+21=-5x+12 equation: 



-8x+21=-5x+12

We move all terms to the left:

-8x+21-(-5x+12)=0

We get rid of parentheses

-8x+5x-12+21=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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