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\sqrt{x\times 3.1}=4.4
Swap sides so that all variable terms are on the left hand side.
3.1x=19.36
Square both sides of the equation.
\frac{3.1x}{3.1}=\frac{19.36}{3.1}
Divide both sides of the equation by 3.1, which is the same as multiplying both sides by the reciprocal of the fraction.
x=\frac{19.36}{3.1}
Dividing by 3.1 undoes the multiplication by 3.1.
x=\frac{968}{155}
Divide 19.36 by 3.1 by multiplying 19.36 by the reciprocal of 3.1.