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2a+3b = 61 4b-3a=19
2a+3b =61 x3
-3a+4b = 19 x2
6a+9b = 183
-6a+8b = 38
17b = 221
b = 13
2a+3b =61
2a+ 3(13)=61
2a=22
a=11
a+b = 11+13 =24