3u+7(5-u)=25

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Solution for 3u+7(5-u)=25 equation:


Simplifying
3u + 7(5 + -1u) = 25
3u + (5 * 7 + -1u * 7) = 25
3u + (35 + -7u) = 25

Reorder the terms:
35 + 3u + -7u = 25

Combine like terms: 3u + -7u = -4u
35 + -4u = 25

Solving
35 + -4u = 25

Solving for variable 'u'.

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

Add '-35' to each side of the equation.
35 + -35 + -4u = 25 + -35

Combine like terms: 35 + -35 = 0
0 + -4u = 25 + -35
-4u = 25 + -35

Combine like terms: 25 + -35 = -10
-4u = -10

Divide each side by '-4'.
u = 2.5

Simplifying
u = 2.5

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