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x in (-oo:+oo)
x/85 = 1.5/30 // - 1.5/30
x/85-(1.5/30) = 0
x/85-0.05 = 0
1/85*x-0.05 = 0 // + 0.05
1/85*x = 0.05 // : 1/85
x = 0.05/1/85
x = 4.24999851
x = 4.24999851
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