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x in (-oo:+oo)
-x/3 = 7.5 // - 7.5
-x/3-7.5 = 0
-1/3*x-7.5 = 0 // + 7.5
-1/3*x = 7.5 // : -1/3
x = 7.5/(-1/3)
x = -22.50000023
x = -22.50000023
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