Решите уравнения: 643-(581-b)=292 987-(x+364)=519

Question

Решите уравнения:
643-(581-b)=292
987-(x+364)=519

Answer 1

643 - 581 + b = 292
62 + b = 292
b = 292 - 62
b = 230

987 - x - 364 = 519
623 - x = 519
- x = 519 - 623
- x = - 104
x = 104

Answer 2

643-(581-b)=292
643-581+b=292
b=292+581-643
b=130

987-(x+364)=519
987-x-364=519
-x=519+364-987
-x=-104.
x=104