-2.1=9.9-4y

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Solution for -2.1=9.9-4y equation: 


Simplifying
-2.1 = 9.9 + -4y

Solving
-2.1 = 9.9 + -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.
-2.1 + 4y = 9.9 + -4y + 4y

Combine like terms: -4y + 4y = 0
-2.1 + 4y = 9.9 + 0
-2.1 + 4y = 9.9

Add '2.1' to each side of the equation.
-2.1 + 2.1 + 4y = 9.9 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + 4y = 9.9 + 2.1
4y = 9.9 + 2.1

Combine like terms: 9.9 + 2.1 = 12
4y = 12

Divide each side by '4'.
y = 3

Simplifying
y = 3

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