3*-1-y=15

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Solution for 3*-1-y=15 equation: 


Simplifying
3 * -1 + -1y = 15

Multiply 3 * -1
-3 + -1y = 15

Solving
-3 + -1y = 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 + -1y = 15 + 3

Combine like terms: -3 + 3 = 0
0 + -1y = 15 + 3
-1y = 15 + 3

Combine like terms: 15 + 3 = 18
-1y = 18

Divide each side by '-1'.
y = -18

Simplifying
y = -18

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