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x in (-oo:+oo)
28*x-(33*x) = 9/14 // - 9/14
28*x-(33*x)-(9/14) = 0
28*x-33*x-9/14 = 0
-5*x-9/14 = 0 // + 9/14
-5*x = 9/14 // : -5
x = 9/14/(-5)
x = -9/70
x = -9/70
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