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x in (-oo:+oo)
(7-x)/2 = 3 // - 3
(7-x)/2-3 = 0
(7-x)/2+(-3*2)/2 = 0
7-x-3*2 = 0
1-x = 0
(1-x)/2 = 0
(1-x)/2 = 0 // * 2
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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