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b in (-oo:+oo)
7*b-4 = -7*b-102 // + -7*b-102
7*b-(-7*b)-4+102 = 0
7*b+7*b-4+102 = 0
14*b+98 = 0 // - 98
14*b = -98 // : 14
b = -98/14
b = -7
b = -7
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