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1/4x+y=7
x-2y=8 / +2y
1/4x+y=7
x= 8+2y
1/4(8+2y)=7
x= 8+2y
2+1/2y=7 /-2
x= 8+2y
1/2y = 5 /*2
x= 8+2y
y = 10
x= 8 + 2*10
y=10
x= 28
y=10