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7 = x*((n-3)/2) // - x*((n-3)/2)
7-(x*((n-3)/2)) = 0
(-1*x*(n-3))/2+7 = 0
(-1*x*(n-3))/2+(2*7)/2 = 0
2*7-1*x*(n-3) = 0
3*x-(n*x)+14 = 0
3*x-(n*x)+14 = 0
3*x+14 = 0 // - 14
3*x = -14 // : 3
x = -14/3
x+14/3 = 0
(x+14/3)/2 = 0
(x+14/3)/2 = 0 // * 2
x+14/3 = 0
x+14/3 = 0 // - 14/3
x = -14/3
x = -14/3
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