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x in (-oo:+oo)
(1/2)*(2*x+6) = (1/5)*(10*x+20) // - (1/5)*(10*x+20)
(1/2)*(2*x+6)-((1/5)*(10*x+20)) = 0
(1/2)*(2*x+6)+(-1/5)*(10*x+20) = 0
1/2*(2*x+6)-1/5*(10*x+20) = 0
1/2*(2*x+6)-1/5*(10*x+20) = 0
-x-1 = 0
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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