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15a+11b=32 ; reemplazndo el valor de a que obtuvimos anteriormente
15( (8+9b)/7)+11b=32
120/7 +135b/7 +11b =32
120/7+212b/7 = 32
212b/7 = 32-120/7
212b/7 = 104/7
212b = 104
b = 104/212
b = 26/53
Reemplazmos el valor de b en:
7a-9b=8
7a-9(26/53)=8
7a-234/53 = 8
7a= 8+234/53
7a= 658/53
a = 94/53