20-7x=-6x+21

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Solution for 20-7x=-6x+21 equation: 



20-7x=-6x+21

We move all terms to the left:

20-7x-(-6x+21)=0

We get rid of parentheses

-7x+6x-21+20=0

We add all the numbers together, and all the variables

-1x-1=0

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

-x=1

x=1/-1

x=-1

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