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(x+7)^2=x^2+14x+49
(a-13)^2=a^2-26a+169
(12n+5)^2=144n^2+120n+25
(2-11m)^2=4-44m+121m^2
(8mn+3p)^2=64m^2n^2+48mnp+9p^2
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