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(13-x)/4 = 1-(x/2) // - 1-(x/2)
(13-x)/4+x/2-1 = 0
(2*(13-x))/(2*4)+(4*x)/(2*4)+(-1*2*4)/(2*4) = 0
2*(13-x)+4*x-1*2*4 = 0
2*x-8+26 = 0
2*x+18 = 0
(2*x+18)/(2*4) = 0
(2*x+18)/(2*4) = 0 // * 2*4
2*x+18 = 0
2*x+18 = 0 // - 18
2*x = -18 // : 2
x = -18/2
x = -9
x = -9
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