z = -2
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10x + 2y + 8z - 5x + 4z - 4y = 10x - 5x + 2y - 4y + 8z + 4z = (10 - 5)x + (2 - 4)y + (8 + 4)z = 5x - 2y + 12z
Zx(3+4)= Zx7 = 7z the answer is 7z
By collecting like terms: 8z+4-2x
(7z - 4)(4z - 7) so z = 4/7 or 7/4
If 3x, 5y and 7z are equal terms, them each of them will equal one third of 357, or 119. 3x = 119 x = 39 and 2/3 5y = 119 y = 23 and 4/5 7z = 119 z = 17