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(-2/3)*x+3 = 13/5 // - 13/5
(-2/3)*x-(13/5)+3 = 0
(-2/3)*x-13/5+3 = 0
2/5-2/3*x = 0 // - 2/5
-2/3*x = -2/5 // : -2/3
x = -2/5/(-2/3)
x = 3/5
x = 3/5
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