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5x=7+y 3x=12-2y
x=7+y/5 x=12-2y/3
7+y/5= 12-2y/3
3(7+y)= 5 (12-2y)
21+3y= 60-10y
2y+10=60-21
12y= 39
y=39/12
Y= 39/12
x=7+y/5 (Sustituyo )
x= 7+39/12/5
x=41/4/5
x=41/20
Comprobación
5x-y=7
5(41/20)-(39/12)=7
41/4-39/12=7
7=7