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b in (-oo:+oo)
(-1/7)*b+5 = 33/7 // - 33/7
(-1/7)*b-(33/7)+5 = 0
(-1/7)*b-33/7+5 = 0
2/7-1/7*b = 0 // - 2/7
-1/7*b = -2/7 // : -1/7
b = -2/7/(-1/7)
b = 2
b = 2
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