15=4.3y-2.1(y-4)

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Solution for 15=4.3y-2.1(y-4) equation: 


Simplifying
15 = 4.3y + -2.1(y + -4)

Reorder the terms:
15 = 4.3y + -2.1(-4 + y)
15 = 4.3y + (-4 * -2.1 + y * -2.1)
15 = 4.3y + (8.4 + -2.1y)

Reorder the terms:
15 = 8.4 + 4.3y + -2.1y

Combine like terms: 4.3y + -2.1y = 2.2y
15 = 8.4 + 2.2y

Solving
15 = 8.4 + 2.2y

Solving for variable 'y'.

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

Add '-2.2y' to each side of the equation.
15 + -2.2y = 8.4 + 2.2y + -2.2y

Combine like terms: 2.2y + -2.2y = 0.0
15 + -2.2y = 8.4 + 0.0
15 + -2.2y = 8.4

Add '-15' to each side of the equation.
15 + -15 + -2.2y = 8.4 + -15

Combine like terms: 15 + -15 = 0
0 + -2.2y = 8.4 + -15
-2.2y = 8.4 + -15

Combine like terms: 8.4 + -15 = -6.6
-2.2y = -6.6

Divide each side by '-2.2'.
y = 3

Simplifying
y = 3

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