20=u-15

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Solution for 20=u-15 equation:


Simplifying
20 = u + -15

Reorder the terms:
20 = -15 + u

Solving
20 = -15 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
20 + -1u = -15 + u + -1u

Combine like terms: u + -1u = 0
20 + -1u = -15 + 0
20 + -1u = -15

Add '-20' to each side of the equation.
20 + -20 + -1u = -15 + -20

Combine like terms: 20 + -20 = 0
0 + -1u = -15 + -20
-1u = -15 + -20

Combine like terms: -15 + -20 = -35
-1u = -35

Divide each side by '-1'.
u = 35

Simplifying
u = 35

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