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