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15z +5x-30y = 5(x - 6y + 3z)
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If: -15z = 0 Then: z = 0
if r=5z and 15z =3 then r=10y
15z² - 22z - 5 = 0 → (5z + 1)(3z - 5) = 0
r = 5z 15z = 3y (divide by 3 to both sides) 5z = y r = y
(a + 2b)(a + 2b)