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x in (-oo:+oo)
4 = (18/9)*x-4 // - (18/9)*x-4
4-((18/9)*x)+4 = 0
4-2*x+4 = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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