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x in (-oo:+oo)
(1/5)*(15*x-20) = (1/2)*(8*x-6) // - (1/2)*(8*x-6)
(1/5)*(15*x-20)-((1/2)*(8*x-6)) = 0
(1/5)*(15*x-20)+(-1/2)*(8*x-6) = 0
1/5*(15*x-20)-1/2*(8*x-6) = 0
1/5*(15*x-20)-1/2*(8*x-6) = 0
-x-1 = 0
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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