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x in (-oo:+oo)
(-4/7)*(x-(1/4))-(3/7) = 0
(-4/7)*(x-1/4)-3/7 = 0
-4/7*(x-1/4)-3/7 = 0
(-4/7*7*(x-1/4))/7-3/7 = 0
-4/7*7*(x-1/4)-3 = 0
-4*x-2 = 0
(-4*x-2)/7 = 0
(-4*x-2)/7 = 0 // * 7
-4*x-2 = 0
-4*x-2 = 0 // + 2
-4*x = 2 // : -4
x = 2/(-4)
x = -1/2
x = -1/2
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