0.8x+0.3(20-x)-0.5x=19

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Solution for 0.8x+0.3(20-x)-0.5x=19 equation: 


Simplifying
0.8x + 0.3(20 + -1x) + -0.5x = 19
0.8x + (20 * 0.3 + -1x * 0.3) + -0.5x = 19
0.8x + (6 + -0.3x) + -0.5x = 19

Reorder the terms:
6 + 0.8x + -0.3x + -0.5x = 19

Combine like terms: 0.8x + -0.3x = 0.5x
6 + 0.5x + -0.5x = 19

Combine like terms: 0.5x + -0.5x = 0.0
6 + 0.0 = 19
6 = 19

Solving
6 = 19

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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