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2014-03-28T16:36:54-03:00
A) x-7=-7-----> x=-7+7---------> x=0

b)3x-4=2x+8--------->3x-2x=8+4---------->x=12

c)7x+4=3x+4------>7x-3x=4-4-----> 4x=0----->x=0/4----->x=0

1 5 1
2014-03-28T16:37:33-03:00
A) x - 7 = -7
x= -7 +7
x = 0

b) 3x - 4 = 2x + 8
x = 8 - 4
x = 4


1 3 1
c) 7x + 4 = 3x + 4
x = 0/4 logo x = 0