20-7(3u+9)+(-8u)=

Solution for 20-7(3u+9)+(-8u)= equation:

Simplifying
20 + -7(3u + 9) + (-8u) = 0

Reorder the terms:
20 + -7(9 + 3u) + (-8u) = 0
20 + (9 * -7 + 3u * -7) + (-8u) = 0
20 + (-63 + -21u) + (-8u) = 0

Combine like terms: 20 + -63 = -43
-43 + -21u + (-8u) = 0

Combine like terms: -21u + (-8u) = -29u
-43 + -29u = 0

Solving
-43 + -29u = 0

Solving for variable 'u'.

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

Add '43' to each side of the equation.
-43 + 43 + -29u = 0 + 43

Combine like terms: -43 + 43 = 0
0 + -29u = 0 + 43
-29u = 0 + 43

Combine like terms: 0 + 43 = 43
-29u = 43

Divide each side by '-29'.
u = -1.482758621

Simplifying
u = -1.482758621