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x in (-oo:+oo)
3-((4/5)*x) = 12 // - 12
3-((4/5)*x)-12 = 0
(-4/5)*x-12+3 = 0
-4/5*x-9 = 0 // + 9
-4/5*x = 9 // : -4/5
x = 9/(-4/5)
x = -45/4
x = -45/4
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