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Solve for x
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x+y=81
Square both sides of the equation.
x+y-y=81-y
Subtract y from both sides of the equation.
x=81-y
Subtracting y from itself leaves 0.
y+x=81
Square both sides of the equation.
y+x-x=81-x
Subtract x from both sides of the equation.
y=81-x
Subtracting x from itself leaves 0.