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4/5-(3*x)-((2/5)*x) = -13/5 // + -13/5
4/5-(3*x)-((2/5)*x)-(-13/5) = 0
(-2/5)*x-3*x+4/5+13/5 = 0
17/5-17/5*x = 0 // - 17/5
-17/5*x = -17/5 // : -17/5
x = -17/5/(-17/5)
x = 1
x = 1
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