-12.3=7.7-4y

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Solution for -12.3=7.7-4y equation: 


Simplifying
-12.3 = 7.7 + -4y

Solving
-12.3 = 7.7 + -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.
-12.3 + 4y = 7.7 + -4y + 4y

Combine like terms: -4y + 4y = 0
-12.3 + 4y = 7.7 + 0
-12.3 + 4y = 7.7

Add '12.3' to each side of the equation.
-12.3 + 12.3 + 4y = 7.7 + 12.3

Combine like terms: -12.3 + 12.3 = 0.0
0.0 + 4y = 7.7 + 12.3
4y = 7.7 + 12.3

Combine like terms: 7.7 + 12.3 = 20
4y = 20

Divide each side by '4'.
y = 5

Simplifying
y = 5

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