a: \(\left(-35\right)+23-\left(-35\right)-47\)
\(=\left(-35\right)+23+35-47\)
\(=\left(-35+35\right)+\left(23-47\right)\)
\(=-24+0=-24\)
c: \(37-\left(-43\right)+\left(-85\right)-\left(-30\right)+15\)
\(=37+43-85+30+15\)
\(=\left(37+43\right)+30-\left(85-15\right)\)
\(=80+30-70\)
=80-40
=40
e: \(-64+\left(-111\right)+64+71\)
\(=-64-111+64+71\)
\(=\left(-64+64\right)+\left(-111+71\right)\)
=-40+0
=-40
g: \(52-\left(-15\right)+\left(+21\right)+\left(-30\right)-28-\left(+19\right)\)
\(=52+15+21-30-28-19\)
\(=\left(52+15-28-19\right)+\left(21-30\right)\)
\(=\left(67-47\right)-9\)
=20-9
=11
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