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15-9*x = -6/(-10) // + -6/(-10)
15-9*x-(-6/(-10)) = 0
15-9*x-3/5 = 0
72/5-9*x = 0 // - 72/5
-9*x = -72/5 // : -9
x = -72/5/(-9)
x = 8/5
x = 8/5
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