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x in (-oo:+oo)
x/7-3 = x/4 // - x/4
x/7-(x/4)-3 = 0
-3/28*x-3 = 0 // + 3
-3/28*x = 3 // : -3/28
x = 3/(-3/28)
x = -28
x = -28
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