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(-2/3)*x+(2/5)*x+3 = 11/5 // - 11/5
(-2/3)*x+(2/5)*x-(11/5)+3 = 0
(-2/3)*x+(2/5)*x-11/5+3 = 0
4/5-4/15*x = 0 // - 4/5
-4/15*x = -4/5 // : -4/15
x = -4/5/(-4/15)
x = 3
x = 3
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