exam Maths Puzzle Numerical Ability

Can the expression (2x-1) be simplified?

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exam Other Question

I have two problems I need help on please:
It says to solve. Then graph.
1) 9t < -81

2) -3/4x>= -5/8

Could you please show me what it would look like worked out on p Simplify the following expression
192.0.6+4^3-2.6*4