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x in (-oo:+oo)
-77/4 = x-(6*x)+3/4 // - x-(6*x)+3/4
6*x-x-77/4-(3/4) = 0
6*x-x-77/4-3/4 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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