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