[tex](6c - 8)(5 - 2c) - 3c(c - 1) = 6c \times 5 - 6c \times 2c - 8 \times 5 + 8 \times 2c - 3c \times c + 3c = 30c - 12 {c}^{2} - 40 + 16c - 3 {c}^{2} + 3c = 49c - 15 {c}^{2} - 40[/tex]
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[tex](6c - 8)(5 - 2c) - 3c(c - 1) = 6c \times 5 - 6c \times 2c - 8 \times 5 + 8 \times 2c - 3c \times c + 3c = 30c - 12 {c}^{2} - 40 + 16c - 3 {c}^{2} + 3c = 49c - 15 {c}^{2} - 40[/tex]