Respostas

2013-09-01T11:05:38-03:00
7(x-5)=3(x+1) <=> 7x-35=3x+3 <=> 4x = 38 <=> x = 19/2 = 9,5

 2(x+1)-(x-1)=0 <=> 2x+2-x+1=0 <=> x=-3

5(x+1)-3(x+2)=6 <=> 5x+5-3x-6=6 <=> 2x=7 <=> x=7/2 = 3,5
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2013-09-01T11:13:28-03:00
É so aplicar a distributiva

7(x-5)=3(x+1)  
7x-35=3x+3
4x=38
x=9,5

  2(x+1)-(x-1)=0   
2x+2-x+1=0
x= -3

 5(x+1)-3(x+2)=6
5x+1-3x-6=6
2x=11
x= 5.5
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