6x+20=21x-40

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Solution for 6x+20=21x-40 equation: 



6x+20=21x-40

We move all terms to the left:

6x+20-(21x-40)=0

We get rid of parentheses

6x-21x+40+20=0

We add all the numbers together, and all the variables

-15x+60=0

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

-15x=-60

x=-60/-15

x=+4

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