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(1/2)*(4*x-8) = (1/5)*(20*x-10) // - (1/5)*(20*x-10)
(1/2)*(4*x-8)-((1/5)*(20*x-10)) = 0
(1/2)*(4*x-8)+(-1/5)*(20*x-10) = 0
1/2*(4*x-8)-1/5*(20*x-10) = 0
1/2*(4*x-8)-1/5*(20*x-10) = 0
-2*x-2 = 0
-2*x-2 = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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