Question

Determine o valor de x em cada caso:
A)x+15=12
B)x-3=12
C)3x=27
D)5x-1=44
E)7x+10=80
F)-2x-1=2
G)3x+2x+5=35
H)5x+7=3
I)5x+13-7x=12
J)-8x+10=2

Answer 1

A)x+15=12

X=12-15

X=-3

X=-3

B)x-3=12

X=12+3

X=15

X=15

C)3x=27

X=27/3

X=9

D)5x-1=44

5x=44+1

5x=45

X=45/5

X=9

E)7x+10=80

7x=80-10

7x=70

X=70/7

X=10

F)-2x-1=2

-2x=2+1

-2x=3

X=3/2

X=1.5

G)3x+2x+5=35

3x+2x=35-5

5x=30

X=30/5

X=6

H)5x+7=3

5x=3-7

5x=4

X=4/5

X=0.8

I)5x+13-7x=12

5x-7x=12-13

-2x=-1

X=-1/-2

X= +0.5

J)-8x+10=2

-8x=-10+2

-8x=-8

X=-8/-8

X=1

(espero ter ajudado <3)