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7 - 1/2a +4=-a +1/2a +1
7 +4-1=-a +1/2a - 1/2a
10=-a
a=-10
14 - (a-8) = -2a + (a+2)
14 - a + 8 = -2a + a + 2
-a + 2a - a = 2 - 14 - 8
0 = -20
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