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83 = 7*x+(2/5)*x+9 // - 7*x+(2/5)*x+9
83-(7*x)-((2/5)*x)-9 = 0
(-2/5)*x-7*x-9+83 = 0
74-37/5*x = 0 // - 74
-37/5*x = -74 // : -37/5
x = -74/(-37/5)
x = 10
x = 10
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