Question

$2(x + 3) + x = 9$
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Answer 1

$2(x + 3) + x = 9 \\ 2x + 6 + x = 9 \\ 3x + 6 = 9 \\ 3x = 9 - 6 \\ 3x = 3 \\ x = 3 \div 3 \\ x = 1$