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x in (-oo:+oo)
500/100 = x/7.5 // - x/7.5
500/100-(x/7.5) = 0
500/100-0.13333333*x = 0
5-0.13333333*x = 0 // - 5
-0.13333333*x = -5 // : -0.13333333
x = -5/(-0.13333333)
x = 37.50000094
x = 37.50000094
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