R+3.9=4

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Solution for R+3.9=4 equation: 


Simplifying
R + 3.9 = 4

Reorder the terms:
3.9 + R = 4

Solving
3.9 + R = 4

Solving for variable 'R'.

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

Add '-3.9' to each side of the equation.
3.9 + -3.9 + R = 4 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + R = 4 + -3.9
R = 4 + -3.9

Combine like terms: 4 + -3.9 = 0.1
R = 0.1

Simplifying
R = 0.1

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