-3*7-3y=-15

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Solution for -3*7-3y=-15 equation: 


Simplifying
-3 * 7 + -3y = -15

Multiply -3 * 7
-21 + -3y = -15

Solving
-21 + -3y = -15

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 + -3y = -15 + 21

Combine like terms: -21 + 21 = 0
0 + -3y = -15 + 21
-3y = -15 + 21

Combine like terms: -15 + 21 = 6
-3y = 6

Divide each side by '-3'.
y = -2

Simplifying
y = -2

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