-3(-3y+1)=-15

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Solution for -3(-3y+1)=-15 equation: 


Simplifying
-3(-3y + 1) = -15

Reorder the terms:
-3(1 + -3y) = -15
(1 * -3 + -3y * -3) = -15
(-3 + 9y) = -15

Solving
-3 + 9y = -15

Solving for variable 'y'.

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

Add '3' to each side of the equation.
-3 + 3 + 9y = -15 + 3

Combine like terms: -3 + 3 = 0
0 + 9y = -15 + 3
9y = -15 + 3

Combine like terms: -15 + 3 = -12
9y = -12

Divide each side by '9'.
y = -1.333333333

Simplifying
y = -1.333333333

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