-5y-15=4y+21

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Solution for -5y-15=4y+21 equation:


Simplifying
-5y + -15 = 4y + 21

Reorder the terms:
-15 + -5y = 4y + 21

Reorder the terms:
-15 + -5y = 21 + 4y

Solving
-15 + -5y = 21 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
-15 + -5y + -4y = 21 + 4y + -4y

Combine like terms: -5y + -4y = -9y
-15 + -9y = 21 + 4y + -4y

Combine like terms: 4y + -4y = 0
-15 + -9y = 21 + 0
-15 + -9y = 21

Add '15' to each side of the equation.
-15 + 15 + -9y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -9y = 21 + 15
-9y = 21 + 15

Combine like terms: 21 + 15 = 36
-9y = 36

Divide each side by '-9'.
y = -4

Simplifying
y = -4

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