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x in (-oo:+oo)
(3*(2-(5*x)))/8 = -1/2 // + -1/2
(3*(2-(5*x)))/8-(-1/2) = 0
(3*(2-5*x))/8+1/2 = 0
(2*3*(2-5*x))/(2*8)+(1*8)/(2*8) = 0
2*3*(2-5*x)+1*8 = 0
20-30*x = 0
(20-30*x)/(2*8) = 0
(20-30*x)/(2*8) = 0 // * 2*8
20-30*x = 0
20-30*x = 0 // - 20
-30*x = -20 // : -30
x = -20/(-30)
x = 2/3
x = 2/3
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