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x in (-oo:+oo)
x/7-1.3 = 18.8 // - 18.8
x/7-18.8-1.3 = 0
1/7*x-20.1 = 0 // + 20.1
1/7*x = 20.1 // : 1/7
x = 20.1/1/7
x = 140.70000281
x = 140.70000281
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