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x in (-oo:+oo)
9-((1/4)*x) = 6 // - 6
9-((1/4)*x)-6 = 0
(-1/4)*x-6+9 = 0
3-1/4*x = 0 // - 3
-1/4*x = -3 // : -1/4
x = -3/(-1/4)
x = 12
x = 12
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