Question

х=(х+270)*0,10
$x = (x + 270) times 0.10$
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Answer 1

0,1х-х+27=0

-0,9х=-27

х=30

Answer 2

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