10r-20=40

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Solution for 10r-20=40 equation: 


Simplifying
10r + -20 = 40

Reorder the terms:
-20 + 10r = 40

Solving
-20 + 10r = 40

Solving for variable 'r'.

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

Add '20' to each side of the equation.
-20 + 20 + 10r = 40 + 20

Combine like terms: -20 + 20 = 0
0 + 10r = 40 + 20
10r = 40 + 20

Combine like terms: 40 + 20 = 60
10r = 60

Divide each side by '10'.
r = 6

Simplifying
r = 6

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