3x-18=8x-9x+-21

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Solution for 3x-18=8x-9x+-21 equation: 



3x-18=8x-9x+-21

We move all terms to the left:

3x-18-(8x-9x+-21)=0

We add all the numbers together, and all the variables

3x-(-1x-21)-18=0

We get rid of parentheses

3x+1x+21-18=0

We add all the numbers together, and all the variables

4x+3=0

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

4x=-3

x=-3/4

x=-3/4

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