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7/5-((9/10)*x) = 5/2 // - 5/2
7/5-((9/10)*x)-(5/2) = 0
(-9/10)*x+7/5-5/2 = 0
-9/10*x-11/10 = 0 // + 11/10
-9/10*x = 11/10 // : -9/10
x = 11/10/(-9/10)
x = -11/9
x = -11/9
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