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b in (-oo:+oo)
5.4 = b/4 // - b/4
5.4-(b/4) = 0
5.4-1/4*b = 0 // - 5.4
-1/4*b = -5.4 // : -1/4
b = -5.4/(-1/4)
b = 21.6
b = 21.6
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