Respostas

2014-05-16T11:36:35-03:00
( 3x - 25) ÷ 2 + 70 =131
( 3 x - 25 ) ÷ 2 = 131 - 70 
( 3 x - 25 ) ÷ 2 = 61
( 3 x - 25 ) = 61 × 2
 ( 3 x - 25 ) = 122
3 x = 122 + 25
3 x = 147
x = 147 ÷ 3
x = 49
1 5 1