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