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