Question

6. resolva as equações:
a) 3p + 2 = -4
b) -7m + 3 = -4
c) 2a + 5 . (a - 1) = 6
d) 7 . (2x - 4) = 30
e) 2a - 3 . (4 - a) = 8
f) 40 = 35 - 4 . (x + 6)
g) 75 - 3 . (a + 25) = 0
i) 4 . (a - 3) - 3 . (4 + a) = 0
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Answer 1

a) 3p = -4 - 2

3p = -6

p = -6/3

p = -2

b) -7m + 3 = -4

-7m = - 4 -3

-7m = -7

m = -1

c) 2a + 5a - 5 = 6

7a = 6 + 5

7a = 11

a = 11/7

a = 1,5

d) 14x - 28 = 30

14x = 30 + 28

14x = 58

x = 58/14

x=  4,14

e) 2a - 12 + 3a = 8

5a =8 + 12

5a = 20

a = 20/5

a = 4

f) 40 = 35 - 4x - 24

4x = 35 - 40 - 24

4x = -19

x = -19/4

x = -4,75

g) 75 - 3a - 75 = 0

3a = 75 - 75

3a = 0

a = 0

i) 4a = 12 - 12 - 3a = 0

7a = 12 - 12

7a = 0

a = 0