-3(-3)+7y=-21

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Solution for -3(-3)+7y=-21 equation: 


Simplifying
-3(-3) + 7y = -21

Multiply -3 * -3
9 + 7y = -21

Solving
9 + 7y = -21

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + 7y = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 7y = -21 + -9
7y = -21 + -9

Combine like terms: -21 + -9 = -30
7y = -30

Divide each side by '7'.
y = -4.285714286

Simplifying
y = -4.285714286

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