2u+6u-3u=20

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Solution for 2u+6u-3u=20 equation: 


Simplifying
2u + 6u + -3u = 20

Combine like terms: 2u + 6u = 8u
8u + -3u = 20

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

Solving
5u = 20

Solving for variable 'u'.

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

Divide each side by '5'.
u = 4

Simplifying
u = 4

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