20=3(u-4)-7u

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Solution for 20=3(u-4)-7u equation:


Simplifying
20 = 3(u + -4) + -7u

Reorder the terms:
20 = 3(-4 + u) + -7u
20 = (-4 * 3 + u * 3) + -7u
20 = (-12 + 3u) + -7u

Combine like terms: 3u + -7u = -4u
20 = -12 + -4u

Solving
20 = -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.
20 + 4u = -12 + -4u + 4u

Combine like terms: -4u + 4u = 0
20 + 4u = -12 + 0
20 + 4u = -12

Add '-20' to each side of the equation.
20 + -20 + 4u = -12 + -20

Combine like terms: 20 + -20 = 0
0 + 4u = -12 + -20
4u = -12 + -20

Combine like terms: -12 + -20 = -32
4u = -32

Divide each side by '4'.
u = -8

Simplifying
u = -8

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