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x in (-oo:+oo)
(1/5)*(10*x-25) = (1/4)*(20*x-8) // - (1/4)*(20*x-8)
(1/5)*(10*x-25)-((1/4)*(20*x-8)) = 0
(1/5)*(10*x-25)+(-1/4)*(20*x-8) = 0
1/5*(10*x-25)-1/4*(20*x-8) = 0
1/5*(10*x-25)-1/4*(20*x-8) = 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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