exam Maths Puzzle Numerical Ability

How do i figure out 2(x+4)-5(x-3)=18

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exam Other Question

Use the mapping rule method to sketch the graph of the following function:
y=2(3)^(-x+1)+4
What is the Transformational Form:
Write the mapping rule:
Show the table of values:
Could someone explain how to solve this problem by multiplying?

8 x a^3+64
___________
3a+12 x 12
Thanks