Question

Equação do 1º grau...

Answer 1

h)

7(x - 2) = 5(x + 3)

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

x = 29/2

i)

3(2x - 1) = -2(x + 3)

6x - 3 = - 2x - 6

6x + 2x = - 6 + 3

8x = -3

x = -3/8

j)

5x - 3(x + 2) = 15

5x - 3x - 6 = 15

2x = 15 + 6

2x = 21

x = 21/2

k)

2x + 3x + 9 = 8(6 - x)

5x + 9 = 48 - 8x

5x + 8x = 48 - 9

14x = 39

x = 39/14

l)

4(x + 10) - 2(x - 5) = 0

4x + 40 - 2x + 10 = 0

2x = - 10 - 40

2x = - 50

x = - 50/2

x = - 25

m)

3(2x + 3) - 4(x - 1) = 3

6x + 9 - 4x + 4 = 3

6x - 4x = 3 - 9 - 4

2x = - 10

x = -10/2

x = - 5

n)

7(x - 1) - 2(x - 5) = x - 5

7x - 7 - 2x + 10 = x - 5

7x - 2x - x = - 5 + 7 - 10

4x = - 8

x = -8/4

x = - 2

o)

2(3 - x) = 3(x - 4) + 15

6 - 2x = 3x - 12 + 15

- 2x - 3x = - 12 + 15 - 6

- 5x = - 3 (-1)

5x = 3

x = 3/5

p)

3(5 - x) - 3(1 - 2x) = 42

15 - 3x - 3 + 6x = 42

- 3x + 6x = 42 - 15 + 3

3x = 30

x = 30/3

x = 10

q)

(4x + 6) - 2x = (x - 6) + 10 + 14

4x + 6 - 2x = x - 6 + 10 + 14

4x - 2x - x = - 6 + 10 + 14 - 6

x = 12

r)

(x - 3) - (x + 2) + 2(x - 1) - 5 = 0

x - 3 - x + 2 + 2x - 2 - 5 = 0

x - x + 2x = 3 - 2 + 2

2x = 3

x = 3/2

s)

3x - 2(4x - 3) = 2 - 3(x - 1)

3x - 8x + 6 = 2 - 3x + 3

3x - 8x + 3x = 2 + 3 - 6

- 2x = - 1 (-1)

2x = 1

x = 1/2

t)

3(x - 1) - (x - 3) + 5(x - 2) = 18

3x - 3 - x - 3 + 5x - 10 = 18

3x - x + 5x = 18 + 3 + 3 + 10

7x = 34

x = 34/7

u)

5(x - 3) - 4(x + 2) = 2 + 3(1 - 2x)

5x - 15 - 4x - 8 = 2 + 3 - 6x

5x - 4x + 6x = 2 + 3 + 15 + 8

7x = 28

x = 28/7

x = 4