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x in (-oo:+oo)
(2*x)/4-(6/4) = -7 // + 7
(2*x)/4-(6/4)+7 = 0
(2*x)/4-3/2+7 = 0
1/2*x+11/2 = 0 // - 11/2
1/2*x = -11/2 // : 1/2
x = -11/2/1/2
x = -11
x = -11
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