Question

Resolva as equaçoes : A) x-3=5
B) x+1=3
C) 3x=15
D) 2x-1=5
E) 5X-2=2x+7
F) 7(x-1)-2=2(x+1)
G)3x/2 - 1/3=x+1/6

Answer 1

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

**********************
B)
x + 1 = 3
x = 3 - 1
x = 2

*******************
C)
3x = 15
x = 15/3
x = 5

*******************
D)
2x - 1 = 5
2x = 5 + 1
2x = 6
x = 6/2
x = 3

*****************************
E)
5x - 2 = 2x + 7
5x - 2x = 7 + 2
3x = 9
x = 9/3
x = 3

*************************************
F)
 7(x - 1) - 2 = 2.(x + 1)
7x - 7 - 2 = 2x + 2
7x - 9 = 2x + 2
7x - 2x = 2 + 9
5x = 11
x = 11/5

******************************
G)
3x/2 - 1/3 = x + 1/6

3x    -  1    =  x +  1
-----    ----            -----
  2        3               6

3.3x - 2.1        6x + 1
-------------  =  -----------
     6                      6

9x - 2 = 6x + 1
9x - 6x = 1 + 2
3x = 3
x = 3/3
x = 1

*********************************

Answer 2

a) x=5+3 x=8
b) x=3-1 x+2
c) x=15/3  x=5
d)2x=5+1 2x=6  x=3
e)5x-2x=7+2  3x=9 x=3
f)7x-7-2=2x+2  7x-2x=2+2+7  5x=11 x=11/5