15=4.3x-2.1(x-4)

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


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

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

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

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

Solving
15 = 8.4 + 2.2x

Solving for variable 'x'.

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

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

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

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

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

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

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

Simplifying
x = 3

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