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