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(13-x)/4 = (1-x)/2 // - (1-x)/2
(13-x)/4-((1-x)/2) = 0
(13-x)/4+(-1*(1-x))/2 = 0
(2*(13-x))/(2*4)+(-1*4*(1-x))/(2*4) = 0
2*(13-x)-1*4*(1-x) = 0
2*x+22 = 0
(2*x+22)/(2*4) = 0
(2*x+22)/(2*4) = 0 // * 2*4
2*x+22 = 0
2*x+22 = 0 // - 22
2*x = -22 // : 2
x = -22/2
x = -11
x = -11
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