7*3-3y=21

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Solution for 7*3-3y=21 equation: 


Simplifying
7 * 3 + -3y = 21

Multiply 7 * 3
21 + -3y = 21

Add '-21' to each side of the equation.
21 + -21 + -3y = 21 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = 21 + -21
-3y = 21 + -21

Combine like terms: 21 + -21 = 0
-3y = 0

Solving
-3y = 0

Solving for variable 'y'.

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

Divide each side by '-3'.
y = 0

Simplifying
y = 0

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