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b in (-oo:+oo)
7-2*b = 4*b+43 // - 4*b+43
7-2*b-(4*b)-43 = 0
7-2*b-4*b-43 = 0
-6*b-36 = 0 // + 36
-6*b = 36 // : -6
b = 36/(-6)
b = -6
b = -6
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