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x in (-oo:+oo)
(1/4)*(x-28) = -19/4 // + -19/4
(1/4)*(x-28)-(-19/4) = 0
(1/4)*(x-28)+19/4 = 0
1/4*(x-28)+19/4 = 0
(1/4*4*(x-28))/4+19/4 = 0
1/4*4*(x-28)+19 = 0
x-9 = 0
(x-9)/4 = 0
(x-9)/4 = 0 // * 4
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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