-3*7+7y=21

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


Simplifying
-3 * 7 + 7y = 21

Multiply -3 * 7
-21 + 7y = 21

Solving
-21 + 7y = 21

Solving for variable 'y'.

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

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

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

Combine like terms: 21 + 21 = 42
7y = 42

Divide each side by '7'.
y = 6

Simplifying
y = 6

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