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b in (-oo:+oo)
(2*b)/5-4 = 36/5 // - 36/5
(2*b)/5-(36/5)-4 = 0
(2*b)/5-36/5-4 = 0
2/5*b-56/5 = 0 // + 56/5
2/5*b = 56/5 // : 2/5
b = 56/5/2/5
b = 28
b = 28
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