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x in (-oo:+oo)
(X-7)/2 = (5-x)/4 // - (5-x)/4
(X-7)/2-((5-x)/4) = 0
(X-7)/2+(-1*(5-x))/4 = 0
(4*(X-7))/(2*4)+(-1*2*(5-x))/(2*4) = 0
4*(X-7)-1*2*(5-x) = 0
4*X+2*x-38 = 0
(4*X+2*x-38)/(2*4) = 0
(4*X+2*x-38)/(2*4) = 0 // * 2*4
4*X+2*x-38 = 0
4*X+2*x-38 = 0 // - 4*X-38
2*x = -(4*X-38) // : 2
x = (-(4*X-38))/2
x = (38-(4*X))/2
x = (38-(4*X))/2
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