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2x+y=7
x=4
2*4+y=7
x=4
8+y=7
x=4
y=7-8=-1
x=4
y=-1
b
x=3y
3x+y=20
x=3y
3*3y+y=20
x=3y
9y+y=20
x=3y
10y=20 /10
x=3y
y=2
x=3*2=6
x=6
y=2