1000 - (42x - 13x) = 1301000 - 42x + 13x = 1301000 - 29x = 130-29x = 130 - 1000-29x = -870x = -870 / -29x = 30
Ответ: x = 30.
1000 - (42x - 13x) = 130
1000 - 42x + 13x = 130
1000 - 29x = 130
-29x = 130 - 1000
-29x = -870
x = -870 / -29
x = 30
Ответ: x = 30.