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b in (-oo:+oo)
b/9 = 4*b-140 // - 4*b-140
b/9-(4*b)+140 = 0
b/9-4*b+140 = 0
140-35/9*b = 0 // - 140
-35/9*b = -140 // : -35/9
b = -140/(-35/9)
b = 36
b = 36
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