7x+y=21y

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Solution for 7x+y=21y equation: 


Simplifying
7x + y = 21y

Solving
7x + y = 21y

Solving for variable 'x'.

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

Add '-1y' to each side of the equation.
7x + y + -1y = 21y + -1y

Combine like terms: y + -1y = 0
7x + 0 = 21y + -1y
7x = 21y + -1y

Combine like terms: 21y + -1y = 20y
7x = 20y

Divide each side by '7'.
x = 2.857142857y

Simplifying
x = 2.857142857y

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