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x in (-oo:+oo)
(x+48)/2 = 7 // - 7
(x+48)/2-7 = 0
(x+48)/2+(-7*2)/2 = 0
x-7*2+48 = 0
x+34 = 0
(x+34)/2 = 0
(x+34)/2 = 0 // * 2
x+34 = 0
x+34 = 0 // - 34
x = -34
x = -34
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