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2(y+5)+y=13
x=y+5
2y+10+y=13
x=y+5
3y=3
x=y+5
y=1
x=6
y=1
b) y=2x-1
x-2(2x-1)=-1
y=2x-1
x-4x+2=-1
y=2x-1
-3x=-3
y=2x-1
x=1
y=1