Question

потрібна допомога

$\sqrt{3x + 4} = 7$
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Answer 1

$\sqrt{3x + 4} = 7 \\ 3x + 4 = 49 \\ 3x = 49 - 4 \\ 3x = 45 \\\sqrt{3 \times 15 + 4} = 7 \\ 7 = 7 \\ x = 15$