0.2(50)+0.8r=0.4(50+5)

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Solution for 0.2(50)+0.8r=0.4(50+5) equation: 


Simplifying
0.2(50) + 0.8r = 0.4(50 + 5)

Multiply 0.2 * 50
10 + 0.8r = 0.4(50 + 5)

Combine like terms: 50 + 5 = 55
10 + 0.8r = 0.4(55)

Multiply 0.4 * 55
10 + 0.8r = 22

Solving
10 + 0.8r = 22

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 + 0.8r = 22 + -10

Combine like terms: 10 + -10 = 0
0 + 0.8r = 22 + -10
0.8r = 22 + -10

Combine like terms: 22 + -10 = 12
0.8r = 12

Divide each side by '0.8'.
r = 15

Simplifying
r = 15

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