16x+21=20x-9

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Solution for 16x+21=20x-9 equation: 



16x+21=20x-9

We move all terms to the left:

16x+21-(20x-9)=0

We get rid of parentheses

16x-20x+9+21=0

We add all the numbers together, and all the variables

-4x+30=0

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

-4x=-30

x=-30/-4

x=7+1/2

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