15u-17u-(-20)=-6

Solution for 15u-17u-(-20)=-6 equation:

Simplifying
15u + -17u + -1(-20) = -6

Multiply -1 * -20
15u + -17u + 20 = -6

Reorder the terms:
20 + 15u + -17u = -6

Combine like terms: 15u + -17u = -2u
20 + -2u = -6

Solving
20 + -2u = -6

Solving for variable 'u'.

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

Add '-20' to each side of the equation.
20 + -20 + -2u = -6 + -20

Combine like terms: 20 + -20 = 0
0 + -2u = -6 + -20
-2u = -6 + -20

Combine like terms: -6 + -20 = -26
-2u = -26

Divide each side by '-2'.
u = 13

Simplifying
u = 13