.Решите уравнения:
a)(5x-2)(5x+2)=21
b)(2x-3)^2=4x^2-3x
c)(6a+7)^2=(6a-5)(6a+5)-10
d)(3a-4)(3a+4)=9a^2-4a
a)(5x-2)(5x+2)=21
b)(2x-3)^2=4x^2-3x
c)(6a+7)^2=(6a-5)(6a+5)-10
d)(3a-4)(3a+4)=9a^2-4a
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