Question

resolva as euquaçoes  3x=15  b)3x=14 c)2x=-12 d)7x=-21 e)13x=13 f)x+5=8 g)x-4=3 h) x+6=5 ix-7=-7 j)x+9=-1 

Answer 1

a) 3x=15
x=15/3
x= 5
b)3x=14
x=14/3
c)2x= -12
x= -12/2
x= -6
d) 7x= -21
x= -21/7
x= -3
e) 13x=13
x=13/13
x=1
f) x+5=8
x= 8-5
x=3
g) x-4=3
x=3+4
x=7
h) x+6=5
x= 5-6
x= -1
i) x-7=-7
x= -7+7
x=0
j) x+9= -1
x= -1-9
x=-10

Answer 2

3x=15 
x = 15/3
x = 5

S[5]

b)3x=14 
x = 14/3

S[14/3]


c)2x=-12
x = -12/2
x = - 6

S[- 6]


d)7x=-21
x = - 21/7
x = -3

S[3]


e)13x=13 
x= 13/13
x = 1

S[1]


f)x+5=8
x = 8 - 5
x = 3

S[3]

g)x-4=3
x = 3 + 4
x = 7

S[7]

h) x+6=5
x = 5 - 6
x = - 1

S[-1]


i)x-7=-7
 x = - 7 + 7
x = 0

S[0]


j)x+9=-1 
x= -1 - 9
x = -10

S[-10]