12=3-(-1y)

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Solution for 12=3-(-1y) equation:


Simplifying
12 = 3 + -1(-1y)

Remove parenthesis around (-1y)
12 = 3 + -1 * -1y

Multiply -1 * -1
12 = 3 + 1y

Solving
12 = 3 + 1y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
12 + -1y = 3 + 1y + -1y

Combine like terms: 1y + -1y = 0
12 + -1y = 3 + 0
12 + -1y = 3

Add '-12' to each side of the equation.
12 + -12 + -1y = 3 + -12

Combine like terms: 12 + -12 = 0
0 + -1y = 3 + -12
-1y = 3 + -12

Combine like terms: 3 + -12 = -9
-1y = -9

Divide each side by '-1'.
y = 9

Simplifying
y = 9

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