\(a,y\times42+y\times57+y=25400\)
\(\left(42+57+1\right)\times y=25400\)
\(100\times y=25400\)
\(y=25400:100\)
\(y=254\)
________________________
\(b,142\times y-41\times y-y=40800\)
\(\left(142-41-1\right)\times y=40800\)
\(100\times y=40800\)
\(y=40800:100\)
\(y=408\)
_____________________________
\(c,486:x-126:x=6\)
\(\left(486-126\right):x=6\)
\(360:x=6\)
\(x=360:6\)
\(x=60\)
_________________________
\(d,725:x+175:x=5\)
\(\left(725+175\right):x=5\)
\(900:x=5\)
\(x=900:5\)
\(x=180\)
________________________
\(e,216215:x+78250:x-192375:x=816\)
\(\left(216215+78250\right):x-192375=816\)
\(294465:x-192375:x=816\)
\(\left(294465-192375\right):x=816\)
\(102090:x=816\)
\(x=102090:816\)
\(x=\dfrac{102090}{816}=\dfrac{17015}{136}\)
