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x in (-oo:+oo)
(-1/2)*(2*x-(4/5)) = -19/15 // + -19/15
(-1/2)*(2*x-(4/5))-(-19/15) = 0
(-1/2)*(2*x-4/5)+19/15 = 0
19/15-1/2*(2*x-4/5) = 0
(-1/2*15*(2*x-4/5))/15+19/15 = 0
19-1/2*15*(2*x-4/5) = 0
25-15*x = 0
(25-15*x)/15 = 0
(25-15*x)/15 = 0 // * 15
25-15*x = 0
25-15*x = 0 // - 25
-15*x = -25 // : -15
x = -25/(-15)
x = 5/3
x = 5/3
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