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b in (-oo:+oo)
130 = b+50*(-16/21) // - b+50*(-16/21)
130-b-(50*(-16/21)) = 0
800/21-b+130 = 0
3530/21-b = 0 // - 3530/21
-b = -3530/21 // * -1
b = 3530/21
b = 3530/21
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