2r-4.2=40

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Solution for 2r-4.2=40 equation: 


Simplifying
2r + -4.2 = 40

Reorder the terms:
-4.2 + 2r = 40

Solving
-4.2 + 2r = 40

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 + 2r = 40 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + 2r = 40 + 4.2
2r = 40 + 4.2

Combine like terms: 40 + 4.2 = 44.2
2r = 44.2

Divide each side by '2'.
r = 22.1

Simplifying
r = 22.1

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