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\frac{4\times 2+1}{2}=g\times \frac{1}{\frac{4}{9}}
Variable g cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by g.
\frac{8+1}{2}=g\times \frac{1}{\frac{4}{9}}
Multiply 4 and 2 to get 8.
\frac{9}{2}=g\times \frac{1}{\frac{4}{9}}
Add 8 and 1 to get 9.
\frac{9}{2}=g\times 1\times \frac{9}{4}
Divide 1 by \frac{4}{9} by multiplying 1 by the reciprocal of \frac{4}{9}.
\frac{9}{2}=g\times \frac{9}{4}
Multiply 1 and \frac{9}{4} to get \frac{9}{4}.
g\times \frac{9}{4}=\frac{9}{2}
Swap sides so that all variable terms are on the left hand side.
g=\frac{9}{2}\times \frac{4}{9}
Multiply both sides by \frac{4}{9}, the reciprocal of \frac{9}{4}.
g=\frac{9\times 4}{2\times 9}
Multiply \frac{9}{2} times \frac{4}{9} by multiplying numerator times numerator and denominator times denominator.
g=\frac{4}{2}
Cancel out 9 in both numerator and denominator.
g=2
Divide 4 by 2 to get 2.