(4r+8)/8=(4r-16)/4

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Solution for (4r+8)/8=(4r-16)/4 equation: 


r in (-oo:+oo)

(4*r+8)/8 = (4*r-16)/4 // - (4*r-16)/4

(4*r+8)/8-((4*r-16)/4) = 0

(4*r+8)/8+(-1*(4*r-16))/4 = 0

(4*(4*r+8))/(4*8)+(-1*8*(4*r-16))/(4*8) = 0

4*(4*r+8)-1*8*(4*r-16) = 0

160-16*r = 0

(160-16*r)/(4*8) = 0

(160-16*r)/(4*8) = 0 // * 4*8

160-16*r = 0

160-16*r = 0 // - 160

-16*r = -160 // : -16

r = -160/(-16)

r = 10

r = 10

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