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\frac{7x^{2}}{21y}+\frac{4y\times 3y}{21y}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3y and 7 is 21y. Multiply \frac{x^{2}}{3y} times \frac{7}{7}. Multiply \frac{4y}{7} times \frac{3y}{3y}.
\frac{7x^{2}+4y\times 3y}{21y}
Since \frac{7x^{2}}{21y} and \frac{4y\times 3y}{21y} have the same denominator, add them by adding their numerators.
\frac{7x^{2}+12y^{2}}{21y}
Do the multiplications in 7x^{2}+4y\times 3y.