10(1+3r)=20

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Solution for 10(1+3r)=20 equation: 


Simplifying
10(1 + 3r) = 20
(1 * 10 + 3r * 10) = 20
(10 + 30r) = 20

Solving
10 + 30r = 20

Solving for variable 'r'.

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

Add '-10' to each side of the equation.
10 + -10 + 30r = 20 + -10

Combine like terms: 10 + -10 = 0
0 + 30r = 20 + -10
30r = 20 + -10

Combine like terms: 20 + -10 = 10
30r = 10

Divide each side by '30'.
r = 0.3333333333

Simplifying
r = 0.3333333333

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