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b in (-oo:+oo)
7*b-4 = -4*b-136 // + -4*b-136
7*b-(-4*b)-4+136 = 0
7*b+4*b-4+136 = 0
11*b+132 = 0 // - 132
11*b = -132 // : 11
b = -132/11
b = -12
b = -12
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