X²+6x+9-9y² factorise this with steps
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x^2+3x+3x+9-9y^2
x(x+3)+3(x+3)-9y^2
=(x+3)(x+3)-9y^2
x(x+3)+3(x+3)-9y^2
=(x+3)(x+3)-9y^2
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