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