One.
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8x plus 4y equals 5 is 8x + 4y = 5.
By rearranging and combining similar terms. For example, 3x + 5x = (3+5)x = 8x.
x2+8x = -3x2+5 4x2+8x-5 = 0 (2x+5)(2x-1) = 0 x = -5/2 or x = 1/2
x2 + 8x + 15 = (x + 3) (x + 5).
8x+5=4x+13 4x=8 x=2 Therefore, your answer is 2.