5*x+8*(1.2-x)=9

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Solution for 5*x+8*(1.2-x)=9 equation: 


Simplifying
5x + 8(1.2 + -1x) = 9
5x + (1.2 * 8 + -1x * 8) = 9
5x + (9.6 + -8x) = 9

Reorder the terms:
9.6 + 5x + -8x = 9

Combine like terms: 5x + -8x = -3x
9.6 + -3x = 9

Solving
9.6 + -3x = 9

Solving for variable 'x'.

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

Add '-9.6' to each side of the equation.
9.6 + -9.6 + -3x = 9 + -9.6

Combine like terms: 9.6 + -9.6 = 0.0
0.0 + -3x = 9 + -9.6
-3x = 9 + -9.6

Combine like terms: 9 + -9.6 = -0.6
-3x = -0.6

Divide each side by '-3'.
x = 0.2

Simplifying
x = 0.2

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