Question

х=(х+270)*0,10
$x = (x + 270) \times 0.10$
​

Answer 1

0,1х-х+27=0

-0,9х=-27

х=30

Answer 2

$x = (x + 270) \times 0.1 \\ (x + 270) \times 0.1 - x = 0 \\ 0.1x + 27 - x = 0 \\ - 0.9x = - 27 \\ x = 30$