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x in (-oo:+oo)
x = (1/2)*(x-115)-115 // - (1/2)*(x-115)-115
x-((1/2)*(x-115))+115 = 0
(-1/2)*(x-115)+x+115 = 0
x-1/2*(x-115)+115 = 0
x-1/2*(x-115)+115 = 0
1/2*x+115/2+115 = 0
1/2*x+345/2 = 0
1/2*x+345/2 = 0
1/2*x+345/2 = 0 // - 345/2
1/2*x = -345/2 // : 1/2
x = -345/2/1/2
x = -345
x = -345
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