Respostas

2014-08-23T14:38:54-03:00
2×(2x+50)-(4x-9)=3×(3-4x)=
4x+100-4x-9=9x+12x
4x-4x-9x-12x=9-100
-3x=-91 ×(-1)
3x=91
x=91/3  

Resposta 91/3