3(4y-5)=21

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Solution for 3(4y-5)=21 equation: 


Simplifying
3(4y + -5) = 21

Reorder the terms:
3(-5 + 4y) = 21
(-5 * 3 + 4y * 3) = 21
(-15 + 12y) = 21

Solving
-15 + 12y = 21

Solving for variable 'y'.

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

Add '15' to each side of the equation.
-15 + 15 + 12y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 12y = 21 + 15
12y = 21 + 15

Combine like terms: 21 + 15 = 36
12y = 36

Divide each side by '12'.
y = 3

Simplifying
y = 3

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