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9x^^= 4
x^^=4/9
x= 2/3
x = 0,67
b. 2x^^ + 5x -3 = 0
2x^^ + 5x = 3
x(2x + 5)= 3
c. 4a^^ + 4a = 15
maaf gitu sj. maaf kl salah..