Question

a) 5x-7=13

B)-3x-12=0

C) -6x=3=4x

D) x+7=6x+28

me ajudem, nesses quatros exercicos por favor !

Answer 1

a) 5x-7=13
5x=13+7
5x=20
x=20/5
x=4

b) -3x-12=0
-3x=12 (-1)
3x= -12
x=12/3
x=4

c) -6x=3=4x
Tem dois sinais de igual, seria + ou -?

d) x+7 = 6x+28
x-6x=28-7
-5x=21 (-1)
5x= -21
x= -21/5

Answer 2

A) 5x-7=13 ==> 5x = 13+7     5x=20==> x = 4
B)-3x-12=0 ==> 3x = - 12 ==> x = - 4

C) -6x=3=4x ==> 6x+4x=3 ==> x = 3/10

D) x+7=6x+28 ==> 6x-x = 7 - 28 ==> 5x= - 21 ==> x= - 21/5