(21+75/(2х+13))*5=120

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(21+75/(2х+13))*5=120

Ответы:

(21+75/(2х+13))*5=120

21*5 +75*5/(2х+13)=120

105 + 375/(2х + 13) = 120

375/(2х + 13) = 120 105 =15

2х + 13 =375 : 15 = 25

2х = 25 13 = 12

2х = 12  х=6





(21+75/(2х+13))*5=120

21*5 +75*5/(2х+13)=120

105 + 375/(2х + 13) = 120

375/(2х + 13) = 120 105 =15

2х + 13 =375 : 15 = 25

2х = 25 13 = 12

2х = 12 

х=6