-2y-21=4y+15

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Solution for -2y-21=4y+15 equation:


Simplifying
-2y + -21 = 4y + 15

Reorder the terms:
-21 + -2y = 4y + 15

Reorder the terms:
-21 + -2y = 15 + 4y

Solving
-21 + -2y = 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 + -2y + -4y = 15 + 4y + -4y

Combine like terms: -2y + -4y = -6y
-21 + -6y = 15 + 4y + -4y

Combine like terms: 4y + -4y = 0
-21 + -6y = 15 + 0
-21 + -6y = 15

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

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

Combine like terms: 15 + 21 = 36
-6y = 36

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

Simplifying
y = -6

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