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8x + 20 = 4 (2x + 5)
You don't. There is no way to factorise it.
8x + 5z - 4x + 3z + 6 = 8x - 4x + 5z + 3z - 6 = 4x + 8z - 6
11x = 8x-6.............. 11x-8x = -6................... 3x= -6 x = -2
8x-7 plus 2x equals 6 plus 5x plus 2?