.9=.8u-19

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Solution for .9=.8u-19 equation:


Simplifying
0.9 = 0.8u + -19

Reorder the terms:
0.9 = -19 + 0.8u

Solving
0.9 = -19 + 0.8u

Solving for variable 'u'.

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

Add '-0.8u' to each side of the equation.
0.9 + -0.8u = -19 + 0.8u + -0.8u

Combine like terms: 0.8u + -0.8u = 0.0
0.9 + -0.8u = -19 + 0.0
0.9 + -0.8u = -19

Add '-0.9' to each side of the equation.
0.9 + -0.9 + -0.8u = -19 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -0.8u = -19 + -0.9
-0.8u = -19 + -0.9

Combine like terms: -19 + -0.9 = -19.9
-0.8u = -19.9

Divide each side by '-0.8'.
u = 24.875

Simplifying
u = 24.875

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