5x-7y=21

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Solution for 5x-7y=21 equation: 


Simplifying
5x + -7y = 21

Solving
5x + -7y = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7y' to each side of the equation.
5x + -7y + 7y = 21 + 7y

Combine like terms: -7y + 7y = 0
5x + 0 = 21 + 7y
5x = 21 + 7y

Divide each side by '5'.
x = 4.2 + 1.4y

Simplifying
x = 4.2 + 1.4y

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