3y+15=y-7

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Solution for 3y+15=y-7 equation: 


Simplifying
3y + 15 = y + -7

Reorder the terms:
15 + 3y = y + -7

Reorder the terms:
15 + 3y = -7 + y

Solving
15 + 3y = -7 + y

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.
15 + 3y + -1y = -7 + y + -1y

Combine like terms: 3y + -1y = 2y
15 + 2y = -7 + y + -1y

Combine like terms: y + -1y = 0
15 + 2y = -7 + 0
15 + 2y = -7

Add '-15' to each side of the equation.
15 + -15 + 2y = -7 + -15

Combine like terms: 15 + -15 = 0
0 + 2y = -7 + -15
2y = -7 + -15

Combine like terms: -7 + -15 = -22
2y = -22

Divide each side by '2'.
y = -11

Simplifying
y = -11

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