Question

URGENTTT DAU COROANA​

Answer 1

$\dfrac{1}{ \sqrt{7} } \bigg( \dfrac{2}{ \sqrt{7} }x - 5 \sqrt{2} \bigg) = x$

$\dfrac{2x}{ \sqrt{7} \cdot \sqrt{7} } - \dfrac{^{ \sqrt{7})} 5 \sqrt{2}}{ \sqrt{7}} = x$

$\dfrac{2x - 5 \sqrt{14} }{7} = x \iff 2x - 5 \sqrt{14} = 7x$

$7x - 2x = - 5 \sqrt{14} \iff 5x = - 5 \sqrt{14}$

$\implies x = - \sqrt{14}$