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x in (-oo:+oo)
12/25 = x/75 // - x/75
12/25-(x/75) = 0
12/25-1/75*x = 0 // - 12/25
-1/75*x = -12/25 // : -1/75
x = -12/25/(-1/75)
x = 36
x = 36
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