4=-2(3.1+Y)

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Solution for 4=-2(3.1+Y) equation: 


Simplifying
4 = -2(3.1 + Y)
4 = (3.1 * -2 + Y * -2)
4 = (-6.2 + -2Y)

Solving
4 = -6.2 + -2Y

Solving for variable 'Y'.

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

Add '2Y' to each side of the equation.
4 + 2Y = -6.2 + -2Y + 2Y

Combine like terms: -2Y + 2Y = 0
4 + 2Y = -6.2 + 0
4 + 2Y = -6.2

Add '-4' to each side of the equation.
4 + -4 + 2Y = -6.2 + -4

Combine like terms: 4 + -4 = 0
0 + 2Y = -6.2 + -4
2Y = -6.2 + -4

Combine like terms: -6.2 + -4 = -10.2
2Y = -10.2

Divide each side by '2'.
Y = -5.1

Simplifying
Y = -5.1

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