20-7x=-9x

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Solution for 20-7x=-9x equation: 



20-7x=-9x

We move all terms to the left:

20-7x-(-9x)=0

We get rid of parentheses

-7x+9x+20=0

We add all the numbers together, and all the variables

2x+20=0

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

2x=-20

x=-20/2

x=-10

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