Question

5. Resolva as seguintes equações:
a) 5x + 8 + 9 = 2x + 47
b) 2x + 3(x+4)=x+56
c) 12x – 4(2x-5)=3x+28
d) 3(x+4)+6=24
e) 5(3x-4)-10=5
f) 4x-2(x+3)=14
g) 3+2(3x-2)=4
h) 3(x+5)-(x+7)=4(1-x)

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Answer 1

Resposta:

a)10

b)11

c)8

d)2

e)7/3

f)10

g)5/6

h)2/3

Explicação passo-a-passo:

a)5x+8+9=2x+47

5x-2x=47-8-9

3x=30

x=10

b)2x+3(x+4)=x+56

2x+3x+12=x+56

2x+3x-x=56-12

4x=44

x=11

c)12x-4(2x-5)=3x+28

12x-8x+20=3x+28

12x-8x-3x=28-20

x=8

d)3(x+4)+6=24

3x+12+6=24

3x=24-12-6

3x=6

x=2

e)5(3x-4)-10=5

15x-20-10=5

15x=5+20+10

15x=35

x=7/3

f)4x-2(x+3)=14

4x-2x-6=14

2x=14+6

2x=20

x=10

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

3+6x-4=4

6x=4+4-3

6x=5

x=5/6

h)3(x+5)-(x+7)=4(1-x)

3x+15-x-7=4-4x

3x-x+4x=4-15+7

6x=-4

x=-4/6

x=-2/3