21=2(u-7)-7u

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Solution for 21=2(u-7)-7u equation:


Simplifying
21 = 2(u + -7) + -7u

Reorder the terms:
21 = 2(-7 + u) + -7u
21 = (-7 * 2 + u * 2) + -7u
21 = (-14 + 2u) + -7u

Combine like terms: 2u + -7u = -5u
21 = -14 + -5u

Solving
21 = -14 + -5u

Solving for variable 'u'.

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

Add '5u' to each side of the equation.
21 + 5u = -14 + -5u + 5u

Combine like terms: -5u + 5u = 0
21 + 5u = -14 + 0
21 + 5u = -14

Add '-21' to each side of the equation.
21 + -21 + 5u = -14 + -21

Combine like terms: 21 + -21 = 0
0 + 5u = -14 + -21
5u = -14 + -21

Combine like terms: -14 + -21 = -35
5u = -35

Divide each side by '5'.
u = -7

Simplifying
u = -7

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