55(-0.4)-3y=-20

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Solution for 55(-0.4)-3y=-20 equation: 


Simplifying
55(-0.4) + -3y = -20

Multiply 55 * -0.4
-22 + -3y = -20

Solving
-22 + -3y = -20

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '22' to each side of the equation.
-22 + 22 + -3y = -20 + 22

Combine like terms: -22 + 22 = 0
0 + -3y = -20 + 22
-3y = -20 + 22

Combine like terms: -20 + 22 = 2
-3y = 2

Divide each side by '-3'.
y = -0.6666666667

Simplifying
y = -0.6666666667

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