book Maths Puzzle Numerical Ability

Solve 2-2(y-1) < 2y-6
The problem is less than or equal to, I couldn't figure out how to put the equal to symbol

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book Other Question

Lisa wants to sell her car through a broker who charges a 10% commission of the selling price.Blue book is $14,900 but Lisa still owes $13,104.Lisa must get enough money to at least pay off the loan. What is the range of the selling price? I am helping in after school tutoring and I want to be sure I am correct-

when you do an equation such as : 5z squared + 9z squared = 504
what do you do with the exponents?