(r-8)/4=1/2

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Solution for (r-8)/4=1/2 equation: 


r in (-oo:+oo)

(r-8)/4 = 1/2 // - 1/2

(r-8)/4-(1/2) = 0

(r-8)/4-1/2 = 0

(2*(r-8))/(2*4)+(-1*4)/(2*4) = 0

2*(r-8)-1*4 = 0

2*r-20 = 0

(2*r-20)/(2*4) = 0

(2*r-20)/(2*4) = 0 // * 2*4

2*r-20 = 0

2*r-20 = 0 // + 20

2*r = 20 // : 2

r = 20/2

r = 10

r = 10

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