3x+5=20u

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Solution for 3x+5=20u equation: 


Simplifying
3x + 5 = 20u

Reorder the terms:
5 + 3x = 20u

Solving
5 + 3x = 20u

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + 3x = -5 + 20u

Combine like terms: 5 + -5 = 0
0 + 3x = -5 + 20u
3x = -5 + 20u

Divide each side by '3'.
x = -1.666666667 + 6.666666667u

Simplifying
x = -1.666666667 + 6.666666667u

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