Since the variable is the same, you can use the distributive property for this one. That is, subtract -8 minus 4, and attach the variable, "x", to the result.
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(2x - 1)(4x + 1)
2(4x - 3)
8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4
8x-2x+4x=10x
8x + 9.16 = 4x + 16 8x - 4x = 16 - 9.16 4x = 6.84 x= 1.71