Question

84а+25а+7=443

4(9+7х)+21=393

Answer 1

84a + 25a + 7 = 443
109a = 443 - 7
a = 436 :109
a = 4

Ответ: {4}

4(9 + 7x) + 21 = 393
36 + 28x + 21 = 393
28x = 393 - 57
x = 336 : 28
x = 12

Ответ: {12}

Answer 2

Да не за что..))

Answer 3

84а+25а+7=443 109а=443-7 109а=436 а=436109 а=4 2) 4(9+7х)+21=393 36+28х+21=393 28х=393-36-21 28х=336 х=33628 х=12