Question

Calcular el valor de "a + b", si: 4ab(7) = 2ba(9)
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Answer 1

$4 \ \times {7}^{2} + a \times 7 + b = 2 \times {9}^{2} + b \times 9 + a \\ 4 \times 28 + 7a + b = 2 \times 81 + 9b + a \\ 112 + 7a + b = 162 + 9b + a \\ 7a - a = 162 - 112 + 9b - b \\ 6a = 50 + 8b \\ 3a = 25 + 4b \\ no \: sale. \: hay \: un \: error$