Question

resolva as equações : a)3x+6=5x+1 b)2x+21=5x c)2x+6=5-3x+6 d)7x+28=0

Answer 1

A)3x+6=5x+1
6-1=5x-3x
5=2x
x=5/2

B)2x+21=5x
21=5x-2x
21=3x
x=21/3
x=7

C)2x+6=5-3x+6
2x+3x=5+6-6
5x=5
x=1

D)7x+28=0
x=-28/7
x=-4

Answer 2

nao sei se ta certo..
a)3x+6=5x+1=
3x+6-5x-1=
-2x-5=0
2x=-5
x=5 sobre 2

b)2x+21=5x
2x+21-5x=0
-3x+21=0
3x=21
x=21 sobre 3
x=7
c)2x+6=5-3x+6
2x+6-5+3x-6=0
5x=-5
x=5 sobre 5
x=1
d)7x+28
7x=28
x=28 sobre 7
x=4