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x in (-oo:+oo)
9/7 = x/4.5 // - x/4.5
9/7-(x/4.5) = 0
9/7-0.22222222*x = 0
9/7-0.22222222*x = 0 // - 9/7
-0.22222222*x = -9/7 // : -0.22222222
x = -9/7/(-0.22222222)
x = 5.78571436
x = 5.78571436
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