Reduza os termos semelhantes nas seguintes expressões algébricas:

26) 8a – [ ( a + 2m) – ( 3a – 3m)] =

27) a– (b – c) + [ 2a + (3b + c)] =

28) –[x + (7 – x) – (5 + 2x)] =

29) { 9x – [ 4x – (x – y)- 5y] + y} =

30) (3a + 2m ) – [ ( a – 2m) – (6a + 2m)] =

31) 7x³- { 3x² - x – [ 2x – { 5x³ - 6x² ) – 4x ]} =

32) 2y – { 3y + [4y – (y – 2x) + 3x ] – 4x } + 2x =

33 8y + { 4y – [ 6x – y- (4x – 3y) – y ] – 2x } =

34) 4x – { 3x + [ 4x – 3y – (6x – 5y ) – 3x ] – 6y}

35) 3x – { 3x – [3x – (3x –y) – y ] – y} – y

36) 2x + ( 2x + y) – (3x – y) + 9x =

37) 5a – { 5a – [ 5a – (5a – m) – m] – m } – m =​