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Anonymous
To solve for two unknown variables (a and b) you need 2 independent equations. You have only one.
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2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
36 -20 = 16
-86
9a + 3b - 11a - 4b = -2a -b
2(a + 4b)