30=5u-15

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Solution for 30=5u-15 equation:


Simplifying
30 = 5u + -15

Reorder the terms:
30 = -15 + 5u

Solving
30 = -15 + 5u

Solving for variable 'u'.

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

Add '-5u' to each side of the equation.
30 + -5u = -15 + 5u + -5u

Combine like terms: 5u + -5u = 0
30 + -5u = -15 + 0
30 + -5u = -15

Add '-30' to each side of the equation.
30 + -30 + -5u = -15 + -30

Combine like terms: 30 + -30 = 0
0 + -5u = -15 + -30
-5u = -15 + -30

Combine like terms: -15 + -30 = -45
-5u = -45

Divide each side by '-5'.
u = 9

Simplifying
u = 9

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