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x in (-oo:+oo)
(-1/3)*x+5 = 4*x-8 // - 4*x-8
(-1/3)*x-(4*x)+5+8 = 0
(-1/3)*x-4*x+5+8 = 0
13-13/3*x = 0 // - 13
-13/3*x = -13 // : -13/3
x = -13/(-13/3)
x = 3
x = 3
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