4.20=.75(3.15)+U

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Solution for 4.20=.75(3.15)+U equation: 


Simplifying
4.20 = 0.75(3.15) + U

Multiply 0.75 * 3.15
4.20 = 2.3625 + U

Solving
4.20 = 2.3625 + 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 = 2.3625 + U + -1U

Combine like terms: U + -1U = 0
4.20 + -1U = 2.3625 + 0
4.20 + -1U = 2.3625

Add '-4.20' to each side of the equation.
4.20 + -4.20 + -1U = 2.3625 + -4.20

Combine like terms: 4.20 + -4.20 = 0.00
0.00 + -1U = 2.3625 + -4.20
-1U = 2.3625 + -4.20

Combine like terms: 2.3625 + -4.20 = -1.8375
-1U = -1.8375

Divide each side by '-1'.
U = 1.8375

Simplifying
U = 1.8375

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