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you do (245x)
-5
(x + 6z)(x - 6z)
6z + 28 = 12z + 10 18 = 6z 3 = z
If 6z=17, divide both sides by 6 z=17/6
5(3-2x)
(x-7)(x-3)
It is 2(2x+3) when factorised
x^2 - 10 x + 25 = (x - 5)(x - 5)
6z =
8x2 - 10x - 3 = (2x - 3)(4x + 1)
6z-513 = -507