28=-7u+2(u+4)

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Solution for 28=-7u+2(u+4) equation:


Simplifying
28 = -7u + 2(u + 4)

Reorder the terms:
28 = -7u + 2(4 + u)
28 = -7u + (4 * 2 + u * 2)
28 = -7u + (8 + 2u)

Reorder the terms:
28 = 8 + -7u + 2u

Combine like terms: -7u + 2u = -5u
28 = 8 + -5u

Solving
28 = 8 + -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.
28 + 5u = 8 + -5u + 5u

Combine like terms: -5u + 5u = 0
28 + 5u = 8 + 0
28 + 5u = 8

Add '-28' to each side of the equation.
28 + -28 + 5u = 8 + -28

Combine like terms: 28 + -28 = 0
0 + 5u = 8 + -28
5u = 8 + -28

Combine like terms: 8 + -28 = -20
5u = -20

Divide each side by '5'.
u = -4

Simplifying
u = -4

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