exam Maths Puzzle Numerical Ability

A ROCK-CLIMBINGFACILITY OFFERS LESSONS FOR $20 PER HALF-HOUR SESSION, PLUS A FULL DAY EQUIPMENT RENTAL OF $7

WHAT LINEAR EQUATION REPRESENTS THIS SITTUATION?

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Need help in solving this it is not a test but for our homework. Every way I have worked it I get a different answer. 0.4p+0.2=4.2p-7.8-0.6p expand

3k^-3c^2(k^3/c^2 - 5k^-3c^-2)