4.20=0.75*4.20+u

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Solution for 4.20=0.75*4.20+u equation: 


Simplifying
4.20 = 0.75 * 4.20 + u

Multiply 0.75 * 4.20
4.20 = 3.15 + u

Solving
4.20 = 3.15 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
4.20 + -1u = 3.15 + u + -1u

Combine like terms: u + -1u = 0
4.20 + -1u = 3.15 + 0
4.20 + -1u = 3.15

Add '-4.20' to each side of the equation.
4.20 + -4.20 + -1u = 3.15 + -4.20

Combine like terms: 4.20 + -4.20 = 0.00
0.00 + -1u = 3.15 + -4.20
-1u = 3.15 + -4.20

Combine like terms: 3.15 + -4.20 = -1.05
-1u = -1.05

Divide each side by '-1'.
u = 1.05

Simplifying
u = 1.05

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