Question

Calcule:
A) 9x + 9 + 3x = 15

B) X -39 = -79

C) 10 = X + 8

D) 15 = X + 20

E) 5X + 6X -16 = 3X + 2X -4

F) 25X = 0

G) 35X = -105

H) 36X = 12

I) 84 = 3X

J) 21 = 3X

Answer 1

A) 12x=15-9

12x=6

x=6/12 => x= 0,5

B) x=-79+39

x= -40

C) 10=x+8

x+8=10

x=10-8 => x= 2

D) 15 = X + 20

x+20=15

x=15-20 => x = -5

E) 5X + 6X -16 = 3X + 2X -4

11X-16=5x-4

-5x+11x=-4+16

-5x+11x=12

6x=12

x=12/6 => x= 2

F) 25x=0

x= 0

G) 35x=-105

x=-105/35 => x= -3

H) 36X = 12

X=12/36 => Simplificando por (12) a fração..: x= 1/3

I) 84=3x

3x=84

x=84/3 => x=28

J) 21=3X

3x=21

x=21/3 => x = 7