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x in (-oo:+oo)
x/7-3.2 = -20.7 // + 20.7
x/7-3.2+20.7 = 0
1/7*x+17.5 = 0 // - 17.5
1/7*x = -17.5 // : 1/7
x = -17.5/1/7
x = -122.50000245
x = -122.50000245
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