20=13-2u

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Solution for 20=13-2u equation:


Simplifying
20 = 13 + -2u

Solving
20 = 13 + -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.
20 + 2u = 13 + -2u + 2u

Combine like terms: -2u + 2u = 0
20 + 2u = 13 + 0
20 + 2u = 13

Add '-20' to each side of the equation.
20 + -20 + 2u = 13 + -20

Combine like terms: 20 + -20 = 0
0 + 2u = 13 + -20
2u = 13 + -20

Combine like terms: 13 + -20 = -7
2u = -7

Divide each side by '2'.
u = -3.5

Simplifying
u = -3.5

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