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\frac{9}{10}x=3+\frac{1\times 2+1}{2}
Multiply both sides of the equation by 3.
\frac{9}{10}x=3+\frac{2+1}{2}
Multiply 1 and 2 to get 2.
\frac{9}{10}x=3+\frac{3}{2}
Add 2 and 1 to get 3.
\frac{9}{10}x=\frac{6}{2}+\frac{3}{2}
Convert 3 to fraction \frac{6}{2}.
\frac{9}{10}x=\frac{6+3}{2}
Since \frac{6}{2} and \frac{3}{2} have the same denominator, add them by adding their numerators.
\frac{9}{10}x=\frac{9}{2}
Add 6 and 3 to get 9.
x=\frac{9}{2}\times \frac{10}{9}
Multiply both sides by \frac{10}{9}, the reciprocal of \frac{9}{10}.
x=\frac{9\times 10}{2\times 9}
Multiply \frac{9}{2} times \frac{10}{9} by multiplying numerator times numerator and denominator times denominator.
x=\frac{10}{2}
Cancel out 9 in both numerator and denominator.
x=5
Divide 10 by 2 to get 5.