Reduza os termos semelhantes nas seguintes expressões algébricas:

38) – { 7a – m – [ 4m – (n – m + 3a) – 4a] + n } =

39) 5xy – [ - (2xy + 5x) + [ 3Y – (-XY + X + 3XY)]} =

40) – {x – 2y + y – [ 3x + 5xy + 6y – (x –y) + 8 ]} =

PARTE 2

1) x - 3 = 5

2) x + 2 = 7

3) x - 7 = -7

4) 6x - 4 = 2x + 8

5) 17x - 2 + 4 = 10 + 5x

6) 4x – 10 = 2x + 2

7) 5x + 6x – 16 = 3x + 2x – 4

8) 5(2x -4) = 7(x + 1) – 3

10) 4−1 = 3(−1)

11) 3(−2) = 2−4

12) 2(−1) = 3+4

13) 3(−1)−7=15​
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