9=4a+13
9-13=4a
-4=4a
-4/4=a
-1=a
a=-1
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-1
8a+4a=144 12a=144 12a/12=144/12 A=144
Add the equations: 4a + 4a - 5b + 5b = 7 + 17 ie 8a = 24 a = 3, so b = 1
3a + 4 = 4a - 3 4 = a -3 (subtract 3a from each side) 7 = a (add 3 to both sides) a = 7
A = 6