90=10-r/4

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Solution for 90=10-r/4 equation: 


r in (-oo:+oo)

90 = 10-(r/4) // - 10-(r/4)

r/4-10+90 = 0

1/4*r+80 = 0 // - 80

1/4*r = -80 // : 1/4

r = -80/1/4

r = -320

r = -320

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