a. \(\left(-8\right).x=-72\)
\(\Leftrightarrow x=\left(-72\right):\left(-8\right)\)
\(\Leftrightarrow x=9\)
b. \(6.x=-54\)
\(\Leftrightarrow x=\left(-54\right):6\)
\(\Leftrightarrow x=-9\)
c. \(\left(-4\right).x=-40\)
\(\Leftrightarrow x=\left(-40\right):\left(-4\right)\)
\(\Leftrightarrow x=10\)
d. \(\left(-6\right).x=-66\)
\(\Leftrightarrow x=\left(-66\right):\left(-6\right)\)
\(\Leftrightarrow x=11\)
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