3(y-7)-y=15

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Solution for 3(y-7)-y=15 equation: 


Simplifying
3(y + -7) + -1y = 15

Reorder the terms:
3(-7 + y) + -1y = 15
(-7 * 3 + y * 3) + -1y = 15
(-21 + 3y) + -1y = 15

Combine like terms: 3y + -1y = 2y
-21 + 2y = 15

Solving
-21 + 2y = 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 + 2y = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 2y = 15 + 21
2y = 15 + 21

Combine like terms: 15 + 21 = 36
2y = 36

Divide each side by '2'.
y = 18

Simplifying
y = 18

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