Question

3) 11. (2x +13) = 231

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Answer 1

$11 \times 2x + 143 = 231$

$22x = 231 - 143$

$22x = 88$

$x = 88 \div 22$

$x = 4$

Verificación

$11 \times (2 \times 4 + 13) = 231$

$11 \times (8 + 13) = 231$

$11 \times 21 = 231$

$231 = 231$