Question

Calcule o valor de x nas equações. a)4(x+3)=20 b)5(2x-1)=2(x+4) c)10-2(x+3)=8+3(2x+5) d)7x+9-2x=20+4x+1

Answer 1

Resposta:

A)4(x+3)=20

4x+12=20

4x=20-12

4x=8

x=8/4

x=2

B)5(2x-1)=2(x+4)

10x-5=2x+8

10x-2x=8+5

8x=13

x=13/8

C)10-2 (x+3)=8

10x+30-2x-6=8

10x-2x=8+6-30

8x=-16

x=-16/8

x=-2

D)7x+9-2x=20+4x+1

7x-2x-4x=20+1-9

x=22