(2/7+3/8+12/7+5/8)x19/63
=(2/7+12/7+3/8+5/8)x19/63
=(14/7+8/8)x 19/63
=(1+2)x19/63
=3x19/63
=19/21
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\(\left(\frac{2}{7}+\frac{3}{8}+\frac{12}{7}+\frac{5}{8}\right).\frac{19}{63}\)
\(=\left\{\left(\frac{2}{7}+\frac{12}{7}\right)+\left(\frac{3}{8}+\frac{5}{8}\right)\right\}.\frac{19}{63}\)
\(=\left(2+1\right).\frac{19}{63}\)
\(=3.\frac{19}{63}\)
\(=\frac{19}{21}\)
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