-5y+21=4y-15

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


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

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

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

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

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

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

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

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

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

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

Simplifying
y = 4

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