3u-u=-19+15

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Solution for 3u-u=-19+15 equation: 


Simplifying
3u + -1u = -19 + 15

Combine like terms: 3u + -1u = 2u
2u = -19 + 15

Combine like terms: -19 + 15 = -4
2u = -4

Solving
2u = -4

Solving for variable 'u'.

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

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

Simplifying
u = -2

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