exam Maths Puzzle Numerical Ability

i need help doing these please.

These are suppose to be open sentences.

[3b-5]=7

[w+5]>1

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exam Other Question

how much would a water bill be per month if
n = 5000c - 15300/4
solve for c
and n = 1800 gallons of quantity

can u help me Simplify

(h^-2 - m^-2)/(m^-1 - h^-1)