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y in (-oo:+oo)
y/7-1.3 = -18.8 // + 18.8
y/7-1.3+18.8 = 0
1/7*y+17.5 = 0 // - 17.5
1/7*y = -17.5 // : 1/7
y = -17.5/1/7
y = -122.50000245
y = -122.50000245
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