2x-(7-5x)-21=0

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Solution for 2x-(7-5x)-21=0 equation: 



2x-(7-5x)-21=0

We add all the numbers together, and all the variables

2x-(-5x+7)-21=0

We get rid of parentheses

2x+5x-7-21=0

We add all the numbers together, and all the variables

7x-28=0

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

7x=28

x=28/7

x=4

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