20-(2х+5.4)=1.21 помогите

Question

20-(2х+5.4)=1.21 помогите

Answer 1

20-(2х+5.4)=1.21; -2х-5,4=1,21-20; -2х=-18,79+5,4; Х=13,39:2; Х=6,695; Или 20-2х-5,4=1,21; -2х=1,21-14,6; Х=13,39:2; Х=6,695

Answer 2

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