20=4(u-5)-8u

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Solution for 20=4(u-5)-8u equation: 


Simplifying
20 = 4(u + -5) + -8u

Reorder the terms:
20 = 4(-5 + u) + -8u
20 = (-5 * 4 + u * 4) + -8u
20 = (-20 + 4u) + -8u

Combine like terms: 4u + -8u = -4u
20 = -20 + -4u

Solving
20 = -20 + -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 = -20 + -4u + 4u

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

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

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

Combine like terms: -20 + -20 = -40
4u = -40

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

Simplifying
u = -10

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