3=1.2+-0.2y

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Solution for 3=1.2+-0.2y equation:


Simplifying
3 = 1.2 + -0.2y

Solving
3 = 1.2 + -0.2y

Solving for variable 'y'.

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

Add '0.2y' to each side of the equation.
3 + 0.2y = 1.2 + -0.2y + 0.2y

Combine like terms: -0.2y + 0.2y = 0.0
3 + 0.2y = 1.2 + 0.0
3 + 0.2y = 1.2

Add '-3' to each side of the equation.
3 + -3 + 0.2y = 1.2 + -3

Combine like terms: 3 + -3 = 0
0 + 0.2y = 1.2 + -3
0.2y = 1.2 + -3

Combine like terms: 1.2 + -3 = -1.8
0.2y = -1.8

Divide each side by '0.2'.
y = -9

Simplifying
y = -9

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