Combine like terms to simplify an expression.
1) -6k + 7k = k (Think of this as -6 + 7, since they share the variable k.)
2) 12r - 8 - 12 = 12r - 20 (You can combine the constants in the equation.)
3) n - 10 + 9n - 3 = 10n - 13 (You can combine the constants and combine those with the variable n.)
[tex] -6k +7k=k\\\\
12r - 8 - 12=12r-20\\\\
n - 10+9n - 3=10n-13 [/tex]
