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