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x in (-oo:+oo)
9-7*x = 3*x+4 // - 3*x+4
9-7*x-(3*x)-4 = 0
9-7*x-3*x-4 = 0
5-10*x = 0 // - 5
-10*x = -5 // : -10
x = -5/(-10)
x = 1/2
x = 1/2
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