Question 345928
6a<=5(a-1)

Multiply 5 by each term inside the parentheses.
6a<=5a-5

Since 5a contains the variable to solve for, move it to the left-hand side of the inequality by subtracting 5a from both sides.
6a-5a<=-5

Since 6a and -5a are like terms, add -5a to 6a to get a.
a<=-5