упростите выражение
1. 3b+(5-7b)
2. -(8c-4)-4
3. 3(8a-4)+6a
4. 7p-2(3p-1)
5. x-(x-(2x-4))

(1) 3b+(5-7b) = 3b+5-7b = 5-4b(2) -(8c-4)-4 = -8c+4-4 = -8c(3) 3(8a-4)+6a = 24a-12+6a = 30a-12(4) 7p-2(3p-1) = 7p-6p+2 = p+2(5) x-(x-(2x-4)) = x-(x-2x+4) = x-(-x+4) = x+x-4 = 2x-4