20=12-4u

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Solution for 20=12-4u equation:


Simplifying
20 = 12 + -4u

Solving
20 = 12 + -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
20 + 4u = 12 + -4u + 4u

Combine like terms: -4u + 4u = 0
20 + 4u = 12 + 0
20 + 4u = 12

Add '-20' to each side of the equation.
20 + -20 + 4u = 12 + -20

Combine like terms: 20 + -20 = 0
0 + 4u = 12 + -20
4u = 12 + -20

Combine like terms: 12 + -20 = -8
4u = -8

Divide each side by '4'.
u = -2

Simplifying
u = -2

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