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Anonymous
-14 + 9a = 389a = 52a = 52/9 or 5.78
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2a+5a+9a = 16a
a= -0.8
a= -4
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5