80-10u=-20

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Solution for 80-10u=-20 equation: 


Simplifying
80 + -10u = -20

Solving
80 + -10u = -20

Solving for variable 'u'.

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

Add '-80' to each side of the equation.
80 + -80 + -10u = -20 + -80

Combine like terms: 80 + -80 = 0
0 + -10u = -20 + -80
-10u = -20 + -80

Combine like terms: -20 + -80 = -100
-10u = -100

Divide each side by '-10'.
u = 10

Simplifying
u = 10

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