-15-40=23-8u

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Solution for -15-40=23-8u equation:


Simplifying
-15 + -40 = 23 + -8u

Combine like terms: -15 + -40 = -55
-55 = 23 + -8u

Solving
-55 = 23 + -8u

Solving for variable 'u'.

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

Add '8u' to each side of the equation.
-55 + 8u = 23 + -8u + 8u

Combine like terms: -8u + 8u = 0
-55 + 8u = 23 + 0
-55 + 8u = 23

Add '55' to each side of the equation.
-55 + 55 + 8u = 23 + 55

Combine like terms: -55 + 55 = 0
0 + 8u = 23 + 55
8u = 23 + 55

Combine like terms: 23 + 55 = 78
8u = 78

Divide each side by '8'.
u = 9.75

Simplifying
u = 9.75

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