Question

1) Determine o valor de x nas equações:

a) 7x + 2 = 4x + 23

b) 4x + 6 = 2x + 18

c) 18 – 3x + 6 = -12 + 2x -4

d) 5 – 2x + 3 = -8 + 4x – 2

e) 5x + 3 + 2x – 4 + 3x + 8 = -13

f) 3.(x + 5) =24

g) 4. ( x – 2 ) = 3x
ME AJUDEM​

Answer 1

a)

7x + 2 = 4x + 23

7×-4×= +23-2

3×=21

×=21÷3

×=7

b)

4x + 6 = 2x + 18

4×-2×=+18-6

2×=12

×=12÷2

×=6

c)

18 – 3x + 6 = -12 + 2x -4

-3×-2×=-12-4-18

-5×= -34

×= -34÷5

×= 6,8

d)

5 – 2x + 3 = -8 + 4x – 2

5+3+8+2=+2×+4×

18=6×

×=18÷6

×=3

e)

5x + 3 + 2x – 4 + 3x + 8 = -13

5×+2×+3×=-13-3+4-8

10×= -20

×=-20÷10

×=-2

f)

3.(x + 5) =24

3×+15=24

3×=24-15

3×=9

×=9÷3

×=3

g)

4. ( x – 2 ) = 3x

4×-8=3×

4×-3×=8

1×=8

×=8÷1

×=8