Question

7. Resolva as equações e determine o valor de x:
a) 25x-17 = 10x + 28

b) 7x + 40 = 11x + 60 - 2x

c) 3x - 1 = 29

d) 6(x-3) - 4(x + 2) = 9x - 1(5x + 3)​

Answer 1

Explicação passo-a-passo:

a)

25x-17=10x+28

25x-10x=28+17

15x=45

x=45/15

x=3

b)

7x+40=11x+60-2x

7x-11x+2x=60-40

-2x=20

x=20/-2

x=-10

c)

3x-1=29

3x=29+1

3x=30

x=30/3

x=10

d)

6(x-3)-4(x+2)=9x-1(5x+3)

6x-18-4x-8=9x-5x-3

6x-4x-9x+5x=-3+18+8

11x-13x=-3+26

-2x=23

x=23/-2