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b in (-oo:+oo)
(3*b)/10 = 7-4 // - 7-4
(3*b)/10-7+4 = 0
3/10*b-3 = 0 // + 3
3/10*b = 3 // : 3/10
b = 3/3/10
b = 10
b = 10
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