Respostas

2014-08-04T19:16:36-03:00
4x + 4 = 12 (distributiva)
4x = 8
x= 2
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2014-08-04T19:18:29-03:00
4x +4=112
4x=112-4
4×=108
×=27

7×-2-5×=18
7× -5×= 18 + 2
2×=20
×=10
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