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x in (-oo:+oo)
x = (90-(0.85*86))/0.5 // - (90-(0.85*86))/0.5
x-((90-(0.85*86))/0.5) = 0
x-2*(90-73.1) = 0
x-33.8 = 0 // + 33.8
x = 33.8
x = 33.8
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