Question

Resolva as equações do 1 grau:

A)30-20+2x=10
B)20x-30=40+30-20
C)10x-12+10=+18-20
D)19+2x-13=10-20
E)13x-23-45=-7x+12​

Answer 1

Explicação passo-a-passo:

a)30 - 20 + 2x = 10

2x = 10 - 30 + 20

2x = -20 + 20

2x = 0

x = 2

b)20x - 30 = 40 + 30 - 20

20x = 40 + 30 - 20 + 30

20x = 70 - 20 + 30

20x= 50 + 30

20x=80

x = 80 ÷ 20

x = 40

c)10x - 12 + 10 = 18 - 20

10x=18 - 20 + 12 - 10

10x = -2 + 12 -10

10x = +2 - 10

10x = -8

x = -8 ÷ 10

x = - 0,8

d)19 + 2x - 13 = 10 - 20

2x= 10 - 20 - 19 + 13

2x = -10 -19 + 13

2x = -29 + 13

2x = -16

x = -16 ÷ 2

x = -8

e)13x - 23 - 45 = -7x + 12

13x + 7x = 12 + 23 + 45

20x = 35 + 45

20x = 80

x = 80 ÷ 20

x = 40