20x+10=21x-9

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Solution for 20x+10=21x-9 equation: 



20x+10=21x-9

We move all terms to the left:

20x+10-(21x-9)=0

We get rid of parentheses

20x-21x+9+10=0

We add all the numbers together, and all the variables

-1x+19=0

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

-x=-19

x=-19/-1

x=+19

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