4x+21=15x-56

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Solution for 4x+21=15x-56 equation: 



4x+21=15x-56

We move all terms to the left:

4x+21-(15x-56)=0

We get rid of parentheses

4x-15x+56+21=0

We add all the numbers together, and all the variables

-11x+77=0

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

-11x=-77

x=-77/-11

x=+7

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