87=4u+15

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Solution for 87=4u+15 equation:


Simplifying
87 = 4u + 15

Reorder the terms:
87 = 15 + 4u

Solving
87 = 15 + 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.
87 + -4u = 15 + 4u + -4u

Combine like terms: 4u + -4u = 0
87 + -4u = 15 + 0
87 + -4u = 15

Add '-87' to each side of the equation.
87 + -87 + -4u = 15 + -87

Combine like terms: 87 + -87 = 0
0 + -4u = 15 + -87
-4u = 15 + -87

Combine like terms: 15 + -87 = -72
-4u = -72

Divide each side by '-4'.
u = 18

Simplifying
u = 18

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