Posted by jane on Sunday, October 2, 2011 at 6:19pm.
2(a-4)=-2
a-4=-1
a=3
2(a-4)+15=13
2a - 8 + 15 = 13
2a + 7 = 13
2a + 7 - 7 = 13 - 7
2a = 6
a = 6/2
a = 3
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