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(x/2)*x-5 = x*((x+3)/2)-1 // - x*((x+3)/2)-1
(x/2)*x-(x*((x+3)/2))-5+1 = 0
(-1*x*(x+3))/2+(x^2)/2-5+1 = 0
(-1*x*(x+3))/2+(x^2)/2+(-5*2)/2+(1*2)/2 = 0
x^2-1*x*(x+3)-5*2+1*2 = 0
2-3*x-10 = 0
-3*x-8 = 0
(-3*x-8)/2 = 0
(-3*x-8)/2 = 0 // * 2
-3*x-8 = 0
-3*x-8 = 0 // + 8
-3*x = 8 // : -3
x = 8/(-3)
x = -8/3
x = -8/3
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