1) 84а + 25а + 7 = 443 2) 4(9+7х) + 21 = 393
109а = 443 - 7 36 + 28х + 21 = 393109а = 436 28х + 57 = 393а = 4 28х = 393 - 57
28х = 336 х = 12
109a = 436
a = 436/109
a = 4
36 + 28x + 21 =393
28x = 393 - 57
28x = 336
x = 336/28
x = 12
1) 84а + 25а + 7 = 443 2) 4(9+7х) + 21 = 393
109а = 443 - 7 36 + 28х + 21 = 393
109а = 436 28х + 57 = 393
а = 4 28х = 393 - 57
28х = 336
х = 12