21=2u-17

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Solution for 21=2u-17 equation:


Simplifying
21 = 2u + -17

Reorder the terms:
21 = -17 + 2u

Solving
21 = -17 + 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
21 + -2u = -17 + 2u + -2u

Combine like terms: 2u + -2u = 0
21 + -2u = -17 + 0
21 + -2u = -17

Add '-21' to each side of the equation.
21 + -21 + -2u = -17 + -21

Combine like terms: 21 + -21 = 0
0 + -2u = -17 + -21
-2u = -17 + -21

Combine like terms: -17 + -21 = -38
-2u = -38

Divide each side by '-2'.
u = 19

Simplifying
u = 19

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