-21=5(u-5)-3u

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Solution for -21=5(u-5)-3u equation:


Simplifying
-21 = 5(u + -5) + -3u

Reorder the terms:
-21 = 5(-5 + u) + -3u
-21 = (-5 * 5 + u * 5) + -3u
-21 = (-25 + 5u) + -3u

Combine like terms: 5u + -3u = 2u
-21 = -25 + 2u

Solving
-21 = -25 + 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
-21 + -2u = -25 + 2u + -2u

Combine like terms: 2u + -2u = 0
-21 + -2u = -25 + 0
-21 + -2u = -25

Add '21' to each side of the equation.
-21 + 21 + -2u = -25 + 21

Combine like terms: -21 + 21 = 0
0 + -2u = -25 + 21
-2u = -25 + 21

Combine like terms: -25 + 21 = -4
-2u = -4

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

Simplifying
u = 2

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