$$\frac { 877 } { 2 } - ( 1 + p - \frac { p - 2 } { 7 } ) = 35$$
$p = \frac{1877}{4} = 469\frac{1}{4} = 469.25$
$$6139-14\left(1+p-\frac{p-2}{7}\right)=490$$
$$6139-14\left(1+p-\left(\frac{1}{7}p-\frac{2}{7}\right)\right)=490$$
$$6139-14\left(1+p-\frac{1}{7}p-\left(-\frac{2}{7}\right)\right)=490$$
$$6139-14\left(1+p-\frac{1}{7}p+\frac{2}{7}\right)=490$$
$$6139-14\left(1+\frac{6}{7}p+\frac{2}{7}\right)=490$$
$$6139-14\left(\frac{7}{7}+\frac{6}{7}p+\frac{2}{7}\right)=490$$
$$6139-14\left(\frac{7+2}{7}+\frac{6}{7}p\right)=490$$
$$6139-14\left(\frac{9}{7}+\frac{6}{7}p\right)=490$$
$$6139-14\times \frac{9}{7}-14\times \frac{6}{7}p=490$$
$$6139+\frac{-14\times 9}{7}-14\times \frac{6}{7}p=490$$
$$6139+\frac{-126}{7}-14\times \frac{6}{7}p=490$$
$$6139-18-14\times \frac{6}{7}p=490$$
$$6139-18+\frac{-14\times 6}{7}p=490$$
$$6139-18+\frac{-84}{7}p=490$$
$$6139-18-12p=490$$
$$6121-12p=490$$
$$-12p=490-6121$$
$$-12p=-5631$$
$$p=\frac{-5631}{-12}$$
$$p=\frac{1877}{4}$$
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