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x in (-oo:+oo)
(x+x+2)/4 = 189.5 // - 189.5
(x+x+2)/4-189.5 = 0
(2*x+2)/4-189.5 = 0
(2*x+2)/4+(-189.5*4)/4 = 0
2*x-189.5*4+2 = 0
2*x-756 = 0
(2*x-756)/4 = 0
(2*x-756)/4 = 0 // * 4
2*x-756 = 0
2*x-756 = 0 // + 756
2*x = 756 // : 2
x = 756/2
x = 378
x = 378
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