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b in (-oo:+oo)
88 = 3*b+4*b+4 // - 3*b+4*b+4
88-(3*b)-(4*b)-4 = 0
88-3*b-4*b-4 = 0
84-7*b = 0 // - 84
-7*b = -84 // : -7
b = -84/(-7)
b = 12
b = 12
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