Question

x+x=90
4x+2×=260 como resolver??

Answer 1

$x + x = 90 \\ 2x = 90 \\ x = \frac{90}{2} \\ x = 45$
$4x + 2x = 260 \\ 6x = 260 \\ x = \frac{260}{6} \div 2 = \frac{130}{3} \\ x = \frac{130}{3}$