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x in (-oo:+oo)
12 = (9/5)*x // - (9/5)*x
12-((9/5)*x) = 0
(-9/5)*x+12 = 0
12-9/5*x = 0 // - 12
-9/5*x = -12 // : -9/5
x = -12/(-9/5)
x = 20/3
x = 20/3
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