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(-2/5)*x-9 = 9/10 // - 9/10
(-2/5)*x-(9/10)-9 = 0
(-2/5)*x-9/10-9 = 0
-2/5*x-99/10 = 0 // + 99/10
-2/5*x = 99/10 // : -2/5
x = 99/10/(-2/5)
x = -99/4
x = -99/4
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