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Anonymous
2a+5a+9a = 16a
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2a-5
9a +8 -2a -3 -5a = 2a +5
2a+5
so 5a = -20 making a = -4
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5