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x in (-oo:+oo)
9.89-((5.4*10.8)/7.5) = x // - x
9.89-x-((5.4*10.8)/7.5) = 0
9.89-x-7.776 = 0
2.114-x = 0 // - 2.114
-x = -2.114 // * -1
x = 2.114
x = 2.114
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