7x-21=4x+56

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Solution for 7x-21=4x+56 equation: 



7x-21=4x+56

We move all terms to the left:

7x-21-(4x+56)=0

We get rid of parentheses

7x-4x-56-21=0

We add all the numbers together, and all the variables

3x-77=0

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

3x=77

x=77/3

x=25+2/3

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