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b in (-oo:+oo)
5-((1/7)*b) = -2 // + 2
2-((1/7)*b)+5 = 0
(-1/7)*b+2+5 = 0
7-1/7*b = 0 // - 7
-1/7*b = -7 // : -1/7
b = -7/(-1/7)
b = 49
b = 49
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