18x-9=14x-21=-3

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Solution for 18x-9=14x-21=-3 equation: 



18x-9=14x-21=-3

We move all terms to the left:

18x-9-(14x-21)=0

We get rid of parentheses

18x-14x+21-9=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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