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b in (-oo:+oo)
100 = 10-7*b-(3*b) // - 10-7*b-(3*b)
3*b-(-7*b)-10+100 = 0
7*b+3*b-10+100 = 0
10*b+90 = 0 // - 90
10*b = -90 // : 10
b = -90/10
b = -9
b = -9
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