a, 4,5 - 2x . 147 = 1114
2x . 147 = 4,5 - 1114
2x . 147 = -1109,5
2x = -1109,5 / 147
2x = \(-\dfrac{317}{42}\)
x = \(-\dfrac{317}{42}:2\)
x = \(-\dfrac{317}{84}\)
b, ( x + 14 - 13 ) : ( 2 + 16 - 14 ) = 746
( x + 1 ) : 4 = 746
x + 1 = 746 . 4
x + 1 = 2984
x = 2984 - 1
x = 2983
c, \(\dfrac{13}{15}-\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{7}{10}\)
\(\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{13}{15}-\dfrac{7}{10}\)
\(\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{1}{6}\)
\(\dfrac{13}{21}+x=\dfrac{1}{6}:\dfrac{7}{12}\)
\(\dfrac{13}{21}+x=\dfrac{2}{7}\)
\(x=\dfrac{2}{7}-\dfrac{13}{21}\)
\(x=-\dfrac{1}{3}\)
