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b in (-oo:+oo)
4*b+6 = 7*b+42 // - 7*b+42
4*b-(7*b)-42+6 = 0
4*b-7*b-42+6 = 0
-3*b-36 = 0 // + 36
-3*b = 36 // : -3
b = 36/(-3)
b = -12
b = -12
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