$$3(7+7i)+i(7+7i)$$
$14+28i$
$$3\times 7+3\times \left(7i\right)+i\left(7+7i\right)$$
$$21+21i+i\left(7+7i\right)$$
$$21+21i+7i+7i^{2}$$
$$21+21i+7i+7\left(-1\right)$$
$$21+21i+\left(-7+7i\right)$$
$$21-7+\left(21+7\right)i$$
$$14+28i$$
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$14$
$$Re(3\times 7+3\times \left(7i\right)+i\left(7+7i\right))$$
$$Re(21+21i+i\left(7+7i\right))$$
$$Re(21+21i+7i+7i^{2})$$
$$Re(21+21i+7i+7\left(-1\right))$$
$$Re(21+21i+\left(-7+7i\right))$$
$$Re(21-7+\left(21+7\right)i)$$
$$Re(14+28i)$$
$$14$$
