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x in (-oo:+oo)
7/50 = x/75 // - x/75
7/50-(x/75) = 0
7/50-1/75*x = 0 // - 7/50
-1/75*x = -7/50 // : -1/75
x = -7/50/(-1/75)
x = 21/2
x = 21/2
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