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x=y+12
3(x-7)=y-7......3(x-7)=4(y-7)
4
sustituimos en la segunda ecuacion x=y+12
3(x-7)=4(y-7)
3(y+12-7)=4y-28
3(y+5)=4y-28
3y+15=4y-28
15+28=4y-3y
43=y
si y=43
x=y+12
x=43+12
x=55
guillermo tiene 55 años y patricia tiene 43 años