3a-21b=0

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Solution for 3a-21b=0 equation: 


Simplifying
3a + -21b = 0

Solving
3a + -21b = 0

Solving for variable 'a'.

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

Add '21b' to each side of the equation.
3a + -21b + 21b = 0 + 21b

Combine like terms: -21b + 21b = 0
3a + 0 = 0 + 21b
3a = 0 + 21b
Remove the zero:
3a = 21b

Divide each side by '3'.
a = 7b

Simplifying
a = 7b

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