15=4.3-2.1(x-4)

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


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

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

Combine like terms: 4.3 + 8.4 = 12.7
15 = 12.7 + -2.1x

Solving
15 = 12.7 + -2.1x

Solving for variable 'x'.

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

Add '2.1x' to each side of the equation.
15 + 2.1x = 12.7 + -2.1x + 2.1x

Combine like terms: -2.1x + 2.1x = 0.0
15 + 2.1x = 12.7 + 0.0
15 + 2.1x = 12.7

Add '-15' to each side of the equation.
15 + -15 + 2.1x = 12.7 + -15

Combine like terms: 15 + -15 = 0
0 + 2.1x = 12.7 + -15
2.1x = 12.7 + -15

Combine like terms: 12.7 + -15 = -2.3
2.1x = -2.3

Divide each side by '2.1'.
x = -1.095238095

Simplifying
x = -1.095238095

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