Question

resolva as equação

a) 2× + 3× +9= 8 (6 - ×)

b) 4 (× + 10) - 2 (× - 5)

c) 3 (2× + 3) - 4 (× - 1) =3

d) 7 (× - 1 ) - 2 (× - 5 )= × - 5

e) 2 ( 3 - × ) =3 ( × - 4 ) + 15

f) 3 ( 5 - × ) - 3 ( 1 - 2×)=42​​

Answer 1

Explicação passo-a-passo:

2× + 3× +9= 8 (6 - ×)

2x+3x+9=48-8x

2x+3x+8x=48-9

5x+8x=48-9

13x=39

x=13

b) 4 (× + 10) - 2 (× - 5)

4x+40-2x+10

4x-2x+40+10

2x+50

c) 3 (2× + 3) - 4 (× - 1) =3

6x+9-4x+4=3

6x-4x=3-9-4

2x=-6-4

2x=-10

x=-10/2

x=-5

d) 7 (× - 1 ) - 2 (× - 5 )= × - 5

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

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

5x-x=-5+7-10

4x=+2-10

4x=-8

x=-8/4

x=-2

e) 2 ( 3 - × ) =3 ( × - 4 ) + 15

6-2x=3x-12+15

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

-5x=3-6

-5x=-3

x=-3/-5

f) 3 ( 5 - × ) - 3 ( 1 - 2×)=42

15-3x-3+6x=42

3x+6x=42-15+3

8x=27+3

8x=30

x=30/8

simplifica por 2

x=15/4.