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x in (-oo:+oo)
75/100 = x/28 // - x/28
75/100-(x/28) = 0
3/4-1/28*x = 0 // - 3/4
-1/28*x = -3/4 // : -1/28
x = -3/4/(-1/28)
x = 21
x = 21
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