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x in (-oo:+oo)
-27 = (3/5)*x // - (3/5)*x
-((3/5)*x)-27 = 0
(-3/5)*x-27 = 0
-3/5*x-27 = 0 // + 27
-3/5*x = 27 // : -3/5
x = 27/(-3/5)
x = -45
x = -45
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