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x in (-oo:+oo)
15/3-(7*x) = 5*x+9 // - 5*x+9
15/3-(7*x)-(5*x)-9 = 0
15/3-7*x-5*x-9 = 0
-12*x-4 = 0 // + 4
-12*x = 4 // : -12
x = 4/(-12)
x = -1/3
x = -1/3
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