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r in (-oo:+oo)
(2/5)*(10*r-50) = 4*(9-(6*r)) // - 4*(9-(6*r))
(2/5)*(10*r-50)-(4*(9-(6*r))) = 0
(2/5)*(10*r-50)-4*(9-6*r) = 0
2/5*(10*r-50)-4*(9-6*r) = 0
2/5*(10*r-50)-4*(9-6*r) = 0
28*r-56 = 0
28*r-56 = 0
28*r-56 = 0 // + 56
28*r = 56 // : 28
r = 56/28
r = 2
r = 2
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