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x in (-oo:+oo)
(-1/4)*(x-(3/4)) = -20 // + 20
(-1/4)*(x-(3/4))+20 = 0
(-1/4)*(x-3/4)+20 = 0
20-1/4*(x-3/4) = 0
20-1/4*(x-3/4) = 0
323/16-1/4*x = 0
323/16-1/4*x = 0
323/16-1/4*x = 0 // - 323/16
-1/4*x = -323/16 // : -1/4
x = -323/16/(-1/4)
x = 323/4
x = 323/4
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