(5+?×19−15−7)/(13×13−156)=6

$(5 + ? \times 19 - 15 - 7) / (13 \times 13 - 156) = 6$

$(5 + x \times 19 - 15 - 7) / (13 \times 13 - 156) = 6$

$(x \times 19 - 17) / (169 - 156) = 6$

$x \times 19 - 17 = 13 \times 6 = 78$

$x \times 19 = 78 + 17 = 95$

$x = 95 / 19 = 5$

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