-3u+-1=-7

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Solution for -3u+-1=-7 equation: 


Simplifying
-3u + -1 = -7

Reorder the terms:
-1 + -3u = -7

Solving
-1 + -3u = -7

Solving for variable 'u'.

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

Add '1' to each side of the equation.
-1 + 1 + -3u = -7 + 1

Combine like terms: -1 + 1 = 0
0 + -3u = -7 + 1
-3u = -7 + 1

Combine like terms: -7 + 1 = -6
-3u = -6

Divide each side by '-3'.
u = 2

Simplifying
u = 2

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