28=3(u-4)-7u

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Solution for 28=3(u-4)-7u equation: 


Simplifying
28 = 3(u + -4) + -7u

Reorder the terms:
28 = 3(-4 + u) + -7u
28 = (-4 * 3 + u * 3) + -7u
28 = (-12 + 3u) + -7u

Combine like terms: 3u + -7u = -4u
28 = -12 + -4u

Solving
28 = -12 + -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
28 + 4u = -12 + -4u + 4u

Combine like terms: -4u + 4u = 0
28 + 4u = -12 + 0
28 + 4u = -12

Add '-28' to each side of the equation.
28 + -28 + 4u = -12 + -28

Combine like terms: 28 + -28 = 0
0 + 4u = -12 + -28
4u = -12 + -28

Combine like terms: -12 + -28 = -40
4u = -40

Divide each side by '4'.
u = -10

Simplifying
u = -10

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