u-7.8=4.21

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Solution for u-7.8=4.21 equation: 


Simplifying
u + -7.8 = 4.21

Reorder the terms:
-7.8 + u = 4.21

Solving
-7.8 + u = 4.21

Solving for variable 'u'.

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

Add '7.8' to each side of the equation.
-7.8 + 7.8 + u = 4.21 + 7.8

Combine like terms: -7.8 + 7.8 = 0.0
0.0 + u = 4.21 + 7.8
u = 4.21 + 7.8

Combine like terms: 4.21 + 7.8 = 12.01
u = 12.01

Simplifying
u = 12.01

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