7y+21x=0

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Solution for 7y+21x=0 equation: 


Simplifying
7y + 21x = 0

Reorder the terms:
21x + 7y = 0

Solving
21x + 7y = 0

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 = 0 + -7y

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

Divide each side by '21'.
x = -0.3333333333y

Simplifying
x = -0.3333333333y

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