УМОЛЯЮ ,РЕШИТЕ №11!!!!!!!!!!!!!

Question

УМОЛЯЮ ,РЕШИТЕ №11!!!!!!!!!!!!!

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Answer 1

(6x+5)^2-4x(3+9x)=49
36x^2+60x+25-12x-36x^2=49
60x+25-12x=49
48x=24
x=0,5