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3x-1=49
Square both sides of the equation.
3x-1-\left(-1\right)=49-\left(-1\right)
Add 1 to both sides of the equation.
3x=49-\left(-1\right)
Subtracting -1 from itself leaves 0.
3x=50
Subtract -1 from 49.
\frac{3x}{3}=\frac{50}{3}
Divide both sides by 3.
x=\frac{50}{3}
Dividing by 3 undoes the multiplication by 3.