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-x+70=64
Square both sides of the equation.
-x+70-70=64-70
Subtract 70 from both sides of the equation.
-x=64-70
Subtracting 70 from itself leaves 0.
-x=-6
Subtract 70 from 64.
\frac{-x}{-1}=-\frac{6}{-1}
Divide both sides by -1.
x=-\frac{6}{-1}
Dividing by -1 undoes the multiplication by -1.
x=6
Divide -6 by -1.