c)
[tex](6 - 10c + 1b) \div 2[/tex]
[tex]3 - 5c + \frac{1}{2} b[/tex]
d)
[tex] - x(x - 5) + 2( - 3)[/tex]
[tex] - x {}^{2} + 5x + 2x - 6[/tex]
[tex] - x {}^{2} + 7x - 6[/tex]
