21x-7y=28

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Solution for 21x-7y=28 equation: 


Simplifying
21x + -7y = 28

Solving
21x + -7y = 28

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.
21x + -7y + 7y = 28 + 7y

Combine like terms: -7y + 7y = 0
21x + 0 = 28 + 7y
21x = 28 + 7y

Divide each side by '21'.
x = 1.333333333 + 0.3333333333y

Simplifying
x = 1.333333333 + 0.3333333333y

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