21y+-7x=

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Solution for 21y+-7x= equation: 


Simplifying
21y + -7x = 0

Reorder the terms:
-7x + 21y = 0

Solving
-7x + 21y = 0

Solving for variable 'x'.

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

Add '-21y' to each side of the equation.
-7x + 21y + -21y = 0 + -21y

Combine like terms: 21y + -21y = 0
-7x + 0 = 0 + -21y
-7x = 0 + -21y
Remove the zero:
-7x = -21y

Divide each side by '-7'.
x = 3y

Simplifying
x = 3y

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