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x in (-oo:+oo)
-5*x-(12/(-4)) = -7 // + 7
7-5*x-(12/(-4)) = 0
3-5*x+7 = 0
10-5*x = 0 // - 10
-5*x = -10 // : -5
x = -10/(-5)
x = 2
x = 2
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