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z in (-oo:+oo)
0.7 = z/3 // - z/3
0.7-(z/3) = 0
0.7-1/3*z = 0 // - 0.7
-1/3*z = -0.7 // : -1/3
z = -0.7/(-1/3)
z = 2.10000002
z = 2.10000002
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