1. 2b + (7a - 9b) =
2. - 4x - (8p - 4x) =
3. (5 + a ) = (7a - 5 ) =
4. ( 4 - 8b) +(- 8b - 15)
5. 2 x - (10 - 8x) =
6) -( 2c - 6) + 6 =
7. -(- 2 - 4a) - (3a +5) =
8. x+(x - 16 ) - (7 + x) =
c раскрытием скобок по действиям, срочно нужно!
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2b + (7a - 9b) = 2b+7a-9b=-7b+7a
-4x - (8p - 4x) = -4x-8p+4x= x-8p
(5 + a ) = (7a - 5 ) = 5+a=7a-5
a-7a=-5-5
-6a= -10
a= -1.6
ну и т.д