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w in (-oo:+oo)
(1/5)*(10*w-15) = (1/4)*(12*w-8) // - (1/4)*(12*w-8)
(1/5)*(10*w-15)-((1/4)*(12*w-8)) = 0
(1/5)*(10*w-15)+(-1/4)*(12*w-8) = 0
1/5*(10*w-15)-1/4*(12*w-8) = 0
1/5*(10*w-15)-1/4*(12*w-8) = 0
-w-1 = 0
-w-1 = 0
-w-1 = 0 // + 1
-w = 1 // * -1
w = -1
w = -1
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