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x in (-oo:+oo)
3/5 = x/75 // - x/75
3/5-(x/75) = 0
3/5-1/75*x = 0 // - 3/5
-1/75*x = -3/5 // : -1/75
x = -3/5/(-1/75)
x = 45
x = 45
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