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x^{2}-2^{2}y^{2}-4x+2+4-1
Expand \left(2y\right)^{2}.
x^{2}-4y^{2}-4x+2+4-1
Calculate 2 to the power of 2 and get 4.
x^{2}-4y^{2}-4x+6-1
Add 2 and 4 to get 6.
x^{2}-4y^{2}-4x+5
Subtract 1 from 6 to get 5.
x^{2}-2^{2}y^{2}-4x+2+4-1
Expand \left(2y\right)^{2}.
x^{2}-4y^{2}-4x+2+4-1
Calculate 2 to the power of 2 and get 4.
x^{2}-4y^{2}-4x+6-1
Add 2 and 4 to get 6.
x^{2}-4y^{2}-4x+5
Subtract 1 from 6 to get 5.