-21=4y+2y

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


Simplifying
-21 = 4y + 2y

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

Solving
-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.
-21 + -6y = 6y + -6y

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

Add '21' to each side of the equation.
-21 + 21 + -6y = 0 + 21

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

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

Divide each side by '-6'.
y = -3.5

Simplifying
y = -3.5

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