-3(7-8u)=

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


Simplifying
-3(7 + -8u) = 0
(7 * -3 + -8u * -3) = 0
(-21 + 24u) = 0

Solving
-21 + 24u = 0

Solving for variable 'u'.

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

Add '21' to each side of the equation.
-21 + 21 + 24u = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 24u = 0 + 21
24u = 0 + 21

Combine like terms: 0 + 21 = 21
24u = 21

Divide each side by '24'.
u = 0.875

Simplifying
u = 0.875

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