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x in (-oo:+oo)
9-((4/3)*x) = -7 // + 7
7-((4/3)*x)+9 = 0
(-4/3)*x+7+9 = 0
16-4/3*x = 0 // - 16
-4/3*x = -16 // : -4/3
x = -16/(-4/3)
x = 12
x = 12
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