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 = 12
-1y = 12

Divide each side by '-1'.
y = -12

Simplifying
y = -12

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