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x in (-oo:+oo)
(-2/5)*x-((1/4)*(x-8)) = 13/2 // - 13/2
(-2/5)*x-((1/4)*(x-8))-(13/2) = 0
(-1/4)*(x-8)+(-2/5)*x-13/2 = 0
(-2*x)/5-1/4*(x-8)-13/2 = 0
(-1/4*2*5*(x-8))/(2*5)+(-2*2*x)/(2*5)+(-13*5)/(2*5) = 0
-1/4*2*5*(x-8)-2*2*x-13*5 = 0
20-13/2*x-65 = 0
-13/2*x-45 = 0
(-13/2*x-45)/(2*5) = 0
(-13/2*x-45)/(2*5) = 0 // * 2*5
-13/2*x-45 = 0
-13/2*x-45 = 0 // + 45
-13/2*x = 45 // : -13/2
x = 45/(-13/2)
x = -90/13
x = -90/13
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