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) + -1U

Multiply 0.75 * 4.20
4.20 = 3.15 + -1U

Solving
4.20 = 3.15 + -1U

Solving for variable 'U'.

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

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

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

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

Combine like terms: 4.20 + -4.20 = 0.00
0.00 + U = 3.15 + -4.20
U = 3.15 + -4.20

Combine like terms: 3.15 + -4.20 = -1.05
U = -1.05

Simplifying
U = -1.05

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