3.9=1.3-(4y)

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


Simplifying
3.9 = 1.3 + -1(4y)

Remove parenthesis around (4y)
3.9 = 1.3 + -1 * 4y

Multiply -1 * 4
3.9 = 1.3 + -4y

Solving
3.9 = 1.3 + -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.
3.9 + 4y = 1.3 + -4y + 4y

Combine like terms: -4y + 4y = 0
3.9 + 4y = 1.3 + 0
3.9 + 4y = 1.3

Add '-3.9' to each side of the equation.
3.9 + -3.9 + 4y = 1.3 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + 4y = 1.3 + -3.9
4y = 1.3 + -3.9

Combine like terms: 1.3 + -3.9 = -2.6
4y = -2.6

Divide each side by '4'.
y = -0.65

Simplifying
y = -0.65

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