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x in (-oo:+oo)
3-((3/4)*x) = -9 // + 9
3-((3/4)*x)+9 = 0
(-3/4)*x+3+9 = 0
12-3/4*x = 0 // - 12
-3/4*x = -12 // : -3/4
x = -12/(-3/4)
x = 16
x = 16
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