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b in (-oo:+oo)
6-5*b = 7*b+90 // - 7*b+90
6-5*b-(7*b)-90 = 0
6-5*b-7*b-90 = 0
-12*b-84 = 0 // + 84
-12*b = 84 // : -12
b = 84/(-12)
b = -7
b = -7
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