0.9(5-2x)+0.6(2.5x-4)=7.2

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Solution for 0.9(5-2x)+0.6(2.5x-4)=7.2 equation: 


Simplifying
0.9(5 + -2x) + 0.6(2.5x + -4) = 7.2
(5 * 0.9 + -2x * 0.9) + 0.6(2.5x + -4) = 7.2
(4.5 + -1.8x) + 0.6(2.5x + -4) = 7.2

Reorder the terms:
4.5 + -1.8x + 0.6(-4 + 2.5x) = 7.2
4.5 + -1.8x + (-4 * 0.6 + 2.5x * 0.6) = 7.2
4.5 + -1.8x + (-2.4 + 1.5x) = 7.2

Reorder the terms:
4.5 + -2.4 + -1.8x + 1.5x = 7.2

Combine like terms: 4.5 + -2.4 = 2.1
2.1 + -1.8x + 1.5x = 7.2

Combine like terms: -1.8x + 1.5x = -0.3x
2.1 + -0.3x = 7.2

Solving
2.1 + -0.3x = 7.2

Solving for variable 'x'.

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

Add '-2.1' to each side of the equation.
2.1 + -2.1 + -0.3x = 7.2 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + -0.3x = 7.2 + -2.1
-0.3x = 7.2 + -2.1

Combine like terms: 7.2 + -2.1 = 5.1
-0.3x = 5.1

Divide each side by '-0.3'.
x = -17

Simplifying
x = -17

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