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x in (-oo:+oo)
4*x-7 = 8*x-(9/3) // - 8*x-(9/3)
4*x-(8*x)+9/3-7 = 0
4*x-8*x+9/3-7 = 0
-4*x-4 = 0 // + 4
-4*x = 4 // : -4
x = 4/(-4)
x = -1
x = -1
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