5y-15=3(2y)-21

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Solution for 5y-15=3(2y)-21 equation:


Simplifying
5y + -15 = 3(2y) + -21

Reorder the terms:
-15 + 5y = 3(2y) + -21

Remove parenthesis around (2y)
-15 + 5y = 3 * 2y + -21

Multiply 3 * 2
-15 + 5y = 6y + -21

Reorder the terms:
-15 + 5y = -21 + 6y

Solving
-15 + 5y = -21 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
-15 + 5y + -6y = -21 + 6y + -6y

Combine like terms: 5y + -6y = -1y
-15 + -1y = -21 + 6y + -6y

Combine like terms: 6y + -6y = 0
-15 + -1y = -21 + 0
-15 + -1y = -21

Add '15' to each side of the equation.
-15 + 15 + -1y = -21 + 15

Combine like terms: -15 + 15 = 0
0 + -1y = -21 + 15
-1y = -21 + 15

Combine like terms: -21 + 15 = -6
-1y = -6

Divide each side by '-1'.
y = 6

Simplifying
y = 6

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