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((-3*X^1)/5)*x+4 = 0
((-3*X)/5)*x+4 = 0
4-3/5*X*x = 0 // - 4
-3/5*X*x = -4 // : -3/5*X
x = -4/(-3/5*X)
x = 20/3*X^-1
x = 20/3*X^-1
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