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x in (-oo:+oo)
-48 = (9/5)*x // - (9/5)*x
-((9/5)*x)-48 = 0
(-9/5)*x-48 = 0
-9/5*x-48 = 0 // + 48
-9/5*x = 48 // : -9/5
x = 48/(-9/5)
x = -80/3
x = -80/3
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