3(y-8)+15=21

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Solution for 3(y-8)+15=21 equation: 


Simplifying
3(y + -8) + 15 = 21

Reorder the terms:
3(-8 + y) + 15 = 21
(-8 * 3 + y * 3) + 15 = 21
(-24 + 3y) + 15 = 21

Reorder the terms:
-24 + 15 + 3y = 21

Combine like terms: -24 + 15 = -9
-9 + 3y = 21

Solving
-9 + 3y = 21

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + 3y = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3y = 21 + 9
3y = 21 + 9

Combine like terms: 21 + 9 = 30
3y = 30

Divide each side by '3'.
y = 10

Simplifying
y = 10

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