Question

Resolva as equações

a) 3 ( x+1)= 5

b) x+1 =3 x
- -
2 3

c) 5 + x= 3 -x
------ -----
2 3

Answer 1

a) 3 ( x+1)= 5 ==> 3x + 3 = 5 ==> 3x = 5-3 ==> 3x = 2 ==> x = 2/3
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b) x+1 = 3x ==> x +  1 = 1 ==> x + 1 = 2 ==> x = 2 -1 ==> x = 1
      2       3             2
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c) 5 + x= 3 -x  ==> 3(5 + x) = 2(3 - x ) ==> 15 + 3x = 6 - 2x
       2        3

3x + 2x =  6 - 15 ==> 5x = - 9 ==> x = - 9/5