book Maths Puzzle Numerical Ability

graph: y = tan 1/2theta

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Dear Abbey can you help me with these problems? Show me a step by step way of doing it? 4x < 36
-4 < 36
4x >-36
Thank You very much! four times the quantity of a number decreased by one is the same as two more than the same number.find the number?
Please help I always have problems with these.
Thanks!
Tina