3*(y+7)=15

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Solution for 3*(y+7)=15 equation: 


Simplifying
3(y + 7) = 15

Reorder the terms:
3(7 + y) = 15
(7 * 3 + y * 3) = 15
(21 + 3y) = 15

Solving
21 + 3y = 15

Solving for variable 'y'.

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

Add '-21' to each side of the equation.
21 + -21 + 3y = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3y = 15 + -21
3y = 15 + -21

Combine like terms: 15 + -21 = -6
3y = -6

Divide each side by '3'.
y = -2

Simplifying
y = -2

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