9x+4=21x-56

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Solution for 9x+4=21x-56 equation: 



9x+4=21x-56

We move all terms to the left:

9x+4-(21x-56)=0

We get rid of parentheses

9x-21x+56+4=0

We add all the numbers together, and all the variables

-12x+60=0

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

-12x=-60

x=-60/-12

x=+5

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