r+4.2=0.3

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Solution for r+4.2=0.3 equation: 


Simplifying
r + 4.2 = 0.3

Reorder the terms:
4.2 + r = 0.3

Solving
4.2 + r = 0.3

Solving for variable 'r'.

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

Add '-4.2' to each side of the equation.
4.2 + -4.2 + r = 0.3 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + r = 0.3 + -4.2
r = 0.3 + -4.2

Combine like terms: 0.3 + -4.2 = -3.9
r = -3.9

Simplifying
r = -3.9

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