15=-5+4u

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Solution for 15=-5+4u equation:


Simplifying
15 = -5 + 4u

Solving
15 = -5 + 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
15 + -4u = -5 + 4u + -4u

Combine like terms: 4u + -4u = 0
15 + -4u = -5 + 0
15 + -4u = -5

Add '-15' to each side of the equation.
15 + -15 + -4u = -5 + -15

Combine like terms: 15 + -15 = 0
0 + -4u = -5 + -15
-4u = -5 + -15

Combine like terms: -5 + -15 = -20
-4u = -20

Divide each side by '-4'.
u = 5

Simplifying
u = 5

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