Verified answer

A) x+30 = 40

X=40-30=10

b)30-20+2x=10

10+2X=10

2X=10-10

2X=0

X=-2

c)3x-10+13=2x+28

3X+3=2X+28

-2X+3X=-3+28

X=25

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

20X-30-40-30+20=0

20X-80=0

20X=80

X= 80/20 = 4

D) -5x+45-89=-90+41

-5X-44= - 49

-5X=44-49

(-1) -5X=-5

5X=5 = X= 5/5 = 1

a) x+30 = 40

Isolamos x

x = 40 - 30

x = 10

b)30-20+2x=10

10 + 2x=10

Isolamos x

2x =10 - 10

2x = 0

x = 0/2

x = 0

c)3x-10+13=2x+28

3x - 2x= 28 + 10 -13

x = 38 -13

x = 25

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

Isolamos x

20x = 40 + 30 - 20 + 30

20x = 100 - 20

20x = 80

x = 80/20

x = 4

e)-5x+45-89=-90+41

- 5x - 44 = - 49

- 5x = - 49 + 44

- 5x = - 5 *(-1)

5x = 5

x = 5/5

x = 1

Amigo vc n consegue fazer sozinho? Isso é o básico do básico. Estude!