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3z+4
Zx(3+4)= Zx7 = 7z the answer is 7z
Z2 - 5Z + 4 = 0 (Z- 1)(Z - 4) so, Z = 1 ---------- and Z = 4 -----------
4 x z = 28 z = 28/4 z = 7
2*-2, 3*-3,4*-4,etc. * is a times sign.