Question

calcule as equaçoes
a)2x+5=13
b)12x-2=10x-8
c)x+10=18
d)3x+8=20
e)x-7=-1
f)x+1-5x=9​

Answer 1

a)2x+5=13

2x=13-5

2x=8

x=8÷2

x=4

b)12x-2=10x-8

12x-10x= -8+2

2x= -6

x= -6÷2

x= -3

c)x+10=18

x=18-10

x=8

d)3x+8=20

3x=20-8

3x=12

x=12÷3

x=4

e)x-7= -1

x= -1+7

x=6

f)x+1-5x=9

x-5x=9-1

-4x=8

x=8÷ -4

x= -2

Answer 2

Resposta:

a. 2x+ 5 =13

2x = 13-5

2x = 8

x = 8/2

× = 4

b 12x -2 = 10x -8

12x -10x = -8 +2

2×=-6

×= -6/2

×= -3

c . × = 18-10

× = 8

d. 3x= 20-8

×= 12/3

×=4

e . ×=-1+7

×=6

f. -4× =9-1

-4× =8

×=8/4

×=2