3.9=1.3-(.4y)

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Solution for 3.9=1.3-(.4y) equation: 


Simplifying
3.9 = 1.3 + -1(0.4y)

Remove parenthesis around (0.4y)
3.9 = 1.3 + -1 * 0.4y

Multiply -1 * 0.4
3.9 = 1.3 + -0.4y

Solving
3.9 = 1.3 + -0.4y

Solving for variable 'y'.

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

Add '0.4y' to each side of the equation.
3.9 + 0.4y = 1.3 + -0.4y + 0.4y

Combine like terms: -0.4y + 0.4y = 0.0
3.9 + 0.4y = 1.3 + 0.0
3.9 + 0.4y = 1.3

Add '-3.9' to each side of the equation.
3.9 + -3.9 + 0.4y = 1.3 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + 0.4y = 1.3 + -3.9
0.4y = 1.3 + -3.9

Combine like terms: 1.3 + -3.9 = -2.6
0.4y = -2.6

Divide each side by '0.4'.
y = -6.5

Simplifying
y = -6.5

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