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x in (-oo:+oo)
7 = 5*x-(10/4) // - 5*x-(10/4)
10/4-(5*x)+7 = 0
10/4-5*x+7 = 0
19/2-5*x = 0 // - 19/2
-5*x = -19/2 // : -5
x = -19/2/(-5)
x = 19/10
x = 19/10
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