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x in (-oo:+oo)
(-1/2)*(x-4)-((1/5)*(x-5)) = x+9 // - x+9
(-1/2)*(x-4)-((1/5)*(x-5))-x-9 = 0
(-1/2)*(x-4)+(-1/5)*(x-5)-x-9 = 0
-1/2*(x-4)-1/5*(x-5)-x-9 = 0
-1/2*(x-4)-1/5*(x-5)-x-9 = 0
3-7/10*x-x-9 = 0
3-17/10*x-9 = 0
-17/10*x-6 = 0
-17/10*x-6 = 0
-17/10*x-6 = 0 // + 6
-17/10*x = 6 // : -17/10
x = 6/(-17/10)
x = -60/17
x = -60/17
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