[tex]a) 5(2km+3m)+4k(m-6k)+(-15m+24k^{2} ) =\\10 km+15m+4km-24k^{2} -15m+24k^{2} =\\14km[/tex]
[tex]b) 6ac(2a-4c+7)-7c(-3+6a)-12a^{2} c=\\12a^{2} c-24ac^{2} +42ac +21c-42ac -12a^{2} c=\\-24a^{2} c+21c[/tex]
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[tex]a) 5(2km+3m)+4k(m-6k)+(-15m+24k^{2} ) =\\10 km+15m+4km-24k^{2} -15m+24k^{2} =\\14km[/tex]
[tex]b) 6ac(2a-4c+7)-7c(-3+6a)-12a^{2} c=\\12a^{2} c-24ac^{2} +42ac +21c-42ac -12a^{2} c=\\-24a^{2} c+21c[/tex]