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x in (-oo:+oo)
1/3-(x/4) = 7/12 // - 7/12
1/3-(x/4)-(7/12) = 0
1/3-(x/4)-7/12 = 0
-1/4*x-1/4 = 0 // + 1/4
-1/4*x = 1/4 // : -1/4
x = 1/4/(-1/4)
x = -1
x = -1
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