42=18-4u

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Solution for 42=18-4u equation:


Simplifying
42 = 18 + -4u

Solving
42 = 18 + -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.
42 + 4u = 18 + -4u + 4u

Combine like terms: -4u + 4u = 0
42 + 4u = 18 + 0
42 + 4u = 18

Add '-42' to each side of the equation.
42 + -42 + 4u = 18 + -42

Combine like terms: 42 + -42 = 0
0 + 4u = 18 + -42
4u = 18 + -42

Combine like terms: 18 + -42 = -24
4u = -24

Divide each side by '4'.
u = -6

Simplifying
u = -6

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