book Maths Puzzle Numerical Ability

What is the first step I do to solve [4t-3]=3

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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? The number of barber jobs in 1998 is 54,000. In 2008 it is 50,000. The change is -4. What is th percent of the decrease?