-8[u+9]=-40

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Solution for -8[u+9]=-40 equation:


Simplifying
-8[u + 9] = -40

Reorder the terms:
-8[9 + u] = -40
[9 * -8 + u * -8] = -40
[-72 + -8u] = -40

Solving
-72 + -8u = -40

Solving for variable 'u'.

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

Add '72' to each side of the equation.
-72 + 72 + -8u = -40 + 72

Combine like terms: -72 + 72 = 0
0 + -8u = -40 + 72
-8u = -40 + 72

Combine like terms: -40 + 72 = 32
-8u = 32

Divide each side by '-8'.
u = -4

Simplifying
u = -4

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