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\left(4x+1\right)\left(4x+1\right)-6=\left(4x-1\right)\left(4x-1\right)
Variable x cannot be equal to any of the values -\frac{1}{4},\frac{1}{4} since division by zero is not defined. Multiply both sides of the equation by \left(4x-1\right)\left(4x+1\right), the least common multiple of 4x-1,16x^{2}-1,4x+1.
\left(4x+1\right)^{2}-6=\left(4x-1\right)\left(4x-1\right)
Multiply 4x+1 and 4x+1 to get \left(4x+1\right)^{2}.
\left(4x+1\right)^{2}-6=\left(4x-1\right)^{2}
Multiply 4x-1 and 4x-1 to get \left(4x-1\right)^{2}.
16x^{2}+8x+1-6=\left(4x-1\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(4x+1\right)^{2}.
16x^{2}+8x-5=\left(4x-1\right)^{2}
Subtract 6 from 1 to get -5.
16x^{2}+8x-5=16x^{2}-8x+1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-1\right)^{2}.
16x^{2}+8x-5-16x^{2}=-8x+1
Subtract 16x^{2} from both sides.
8x-5=-8x+1
Combine 16x^{2} and -16x^{2} to get 0.
8x-5+8x=1
Add 8x to both sides.
16x-5=1
Combine 8x and 8x to get 16x.
16x=1+5
Add 5 to both sides.
16x=6
Add 1 and 5 to get 6.
x=\frac{6}{16}
Divide both sides by 16.
x=\frac{3}{8}
Reduce the fraction \frac{6}{16} to lowest terms by extracting and canceling out 2.