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x+y=40-x
Add 35 and 5 to get 40.
x+y+x=40
Add x to both sides.
2x+y=40
Combine x and x to get 2x.
2x=40-y
Subtract y from both sides.
\frac{2x}{2}=\frac{40-y}{2}
Divide both sides by 2.
x=\frac{40-y}{2}
Dividing by 2 undoes the multiplication by 2.
x=-\frac{y}{2}+20
Divide 40-y by 2.
x+y=40-x
Add 35 and 5 to get 40.
y=40-x-x
Subtract x from both sides.
y=40-2x
Combine -x and -x to get -2x.