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1=a*2+b
3=a*1+b
1=2a+b
3=a+b
1=2a+b
a+b=3
1=2a+b
a=3-b
1=2(3-b)+b
a=3-b
1=6-2b+b
a=3-b
b=6-1
a=3-b
b=5
a=3-5
b=5
a=-2
y=-2x+5