Question

Resolva as equações do primeiro grau, a seguir:

a)3x -5= 25 f) -2x - 15= 3x + 45

b)7x +10= 5x g)3. (2x - 4) = 18

c)x/4 + 7 =12 h) 5. (3x +5) = 2. (6x - 10)

d)5x/2 - 4 = -14 I) 2x+6/3 = 3x-6/2

e)6x - 5= 4x +10 j) 4x+1/2 = x-6/3

Answer 1

Resposta:

Explicação passo-a-passo

a)3x -5= 25

3x=25+5

3x=30

X=30/3

x=10

f) -2x - 15= 3x + 45

-2x-3x=45+15

-5x=60

X=60/-5

X=-12

b)7x +10= 5x

7x-5x=-10

2x=-10

X=-10/2

X=-5

g)3. (2x - 4) = 18

6x-12=18

6x=18+12

6x=30

X=30/6

X=5

c)x/4 + 7 =12

h) 5. (3x +5) = 2. (6x - 10)

15x+25=12x-20

15x-12x=-20-25

3x=-45

X=-45/3

X=-15

e)6x - 5= 4x +10

6x-4x=10+5

2x=15

X=15/2