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x in (-oo:+oo)
1/3-(3*x) = (3*x)/5+3 // - (3*x)/5+3
1/3-(3*x)-((3*x)/5)-3 = 0
(-3/5)*x-3*x+1/3-3 = 0
-18/5*x-8/3 = 0 // + 8/3
-18/5*x = 8/3 // : -18/5
x = 8/3/(-18/5)
x = -20/27
x = -20/27
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