Question

Encontre Oh Valor De X Nas Equações A Baixo:

a) 20x - 30 = 40 + 30 - 20
b) 13x -23 -45 = -7x +12
c)9x - 4x + 10 = 7x - 30
d) 10x - 5. (1 + x) = 3. (2x - 2) - 20​

Answer 1

Resposta:

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

20x=70-20+30

20x=50+30

20x=80

x=80/20

x=4

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

13x-68=7x+12

13x-7x=68+12

6x=80

x=80/6

x=40/3

c) 9x-4x+10=7x-30

5x+10=7x-30

5x-7x=-30-10

-2x=-40

x=-40/-2

x=20

d)10x-5×(1+x)=3×(2x-2)-20

10x-5-5x=6x-6-20

5x-5=6x-26

5x-6x=-26+5

-1x= -21

x=-21/-1

x=21