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x in (-oo:+oo)
x/7-4 = x/3 // - x/3
x/7-(x/3)-4 = 0
-4/21*x-4 = 0 // + 4
-4/21*x = 4 // : -4/21
x = 4/(-4/21)
x = -21
x = -21
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