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x in (-oo:+oo)
(1/5)*(10*x-25) = (1/2)*(10*x-4) // - (1/2)*(10*x-4)
(1/5)*(10*x-25)-((1/2)*(10*x-4)) = 0
(1/5)*(10*x-25)+(-1/2)*(10*x-4) = 0
1/5*(10*x-25)-1/2*(10*x-4) = 0
1/5*(10*x-25)-1/2*(10*x-4) = 0
-3*x-3 = 0
-3*x-3 = 0
-3*x-3 = 0 // + 3
-3*x = 3 // : -3
x = 3/(-3)
x = -1
x = -1
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