7-8=-3u+7u

Solution for 7-8=-3u+7u equation:

Simplifying
7 + -8 = -3u + 7u

Combine like terms: 7 + -8 = -1
-1 = -3u + 7u

Combine like terms: -3u + 7u = 4u
-1 = 4u

Solving
-1 = 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.
-1 + -4u = 4u + -4u

Combine like terms: 4u + -4u = 0
-1 + -4u = 0

Add '1' to each side of the equation.
-1 + 1 + -4u = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -4u = 0 + 1
-4u = 0 + 1

Combine like terms: 0 + 1 = 1
-4u = 1

Divide each side by '-4'.
u = -0.25

Simplifying
u = -0.25