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