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b in (-oo:+oo)
b/90 = 2/3 // - 2/3
b/90-(2/3) = 0
b/90-2/3 = 0
1/90*b-2/3 = 0 // + 2/3
1/90*b = 2/3 // : 1/90
b = 2/3/1/90
b = 60
b = 60
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