book Maths Puzzle Numerical Ability

7a-3=3-2a
This is what we came up with. Not coming out right.
7a-3+3=3-2a+3
7a=2a

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book Other Question

Hello again. Once again I would like to verify my work. Could a tutor please show me the solution to the below problem. In advance, thank you.

Graph the hyperbola whose equ 1.)four shovels of sand are used for every 5 shovels of gravel in making concrete.how much gravel is needed for 64 shovels of sand?