3u+5u+u-7=20

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Solution for 3u+5u+u-7=20 equation: 


Simplifying
3u + 5u + u + -7 = 20

Reorder the terms:
-7 + 3u + 5u + u = 20

Combine like terms: 3u + 5u = 8u
-7 + 8u + u = 20

Combine like terms: 8u + u = 9u
-7 + 9u = 20

Solving
-7 + 9u = 20

Solving for variable 'u'.

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

Add '7' to each side of the equation.
-7 + 7 + 9u = 20 + 7

Combine like terms: -7 + 7 = 0
0 + 9u = 20 + 7
9u = 20 + 7

Combine like terms: 20 + 7 = 27
9u = 27

Divide each side by '9'.
u = 3

Simplifying
u = 3

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