Уравнение. 84a+25a+7=443. 4(9+7x)21=393. 486:(5x+2)=18. 5(14+ b)+6b=258
84a+25a+7=443,109а+7=443,109а=436,а=4
1)84а + 25а + 7 = 443 109а= 443 -7 109а = 436 а = 4 2) 4 (9 + 7х) + 21 = 393 36 + 28х + 21 = 393 28х = 393 - 21-36 28х = 336 х = 12 3) 486: (5х + 2) = 18 5х + 2 = 486:18 5х = 27 -2 5х = 25 х = 5 4) 5(14 + б) + 6б = 268 70 + 5б + 6б = 268 11б = 198 б = 18