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x in (-oo:+oo)
75/6 = x/4 // - x/4
75/6-(x/4) = 0
25/2-1/4*x = 0 // - 25/2
-1/4*x = -25/2 // : -1/4
x = -25/2/(-1/4)
x = 50
x = 50
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