45=3u-15

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Solution for 45=3u-15 equation:


Simplifying
45 = 3u + -15

Reorder the terms:
45 = -15 + 3u

Solving
45 = -15 + 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
45 + -3u = -15 + 3u + -3u

Combine like terms: 3u + -3u = 0
45 + -3u = -15 + 0
45 + -3u = -15

Add '-45' to each side of the equation.
45 + -45 + -3u = -15 + -45

Combine like terms: 45 + -45 = 0
0 + -3u = -15 + -45
-3u = -15 + -45

Combine like terms: -15 + -45 = -60
-3u = -60

Divide each side by '-3'.
u = 20

Simplifying
u = 20

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