book Maths Puzzle Numerical Ability

Hello,
What is the domain and range of f? f(x)= -4x

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could you help me with this equations, im stuck!!!

3x-5=2x

could you show me how i can solve this equation.
please!!!
Thanks Please answer this question step-by-step with explanations for each.

The dome over a town hall has a parabolic shape. The dome measures 48m across and rises 12m at its centre.