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\frac{1}{3}x+2x=3
Divide 4 by 2 to get 2.
\frac{7}{3}x=3
Combine \frac{1}{3}x and 2x to get \frac{7}{3}x.
x=3\times \frac{3}{7}
Multiply both sides by \frac{3}{7}, the reciprocal of \frac{7}{3}.
x=\frac{3\times 3}{7}
Express 3\times \frac{3}{7} as a single fraction.
x=\frac{9}{7}
Multiply 3 and 3 to get 9.