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x in (-oo:+oo)
(-3/5)*x-(1/3) = (-4/5)*x-(1/5) // - (-4/5)*x-(1/5)
(-3/5)*x-((-4/5)*x)-(1/3)+1/5 = 0
(-3/5)*x+(4/5)*x-1/3+1/5 = 0
1/5*x-2/15 = 0 // + 2/15
1/5*x = 2/15 // : 1/5
x = 2/15/1/5
x = 2/3
x = 2/3
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