exam Maths Puzzle Numerical Ability

problem 6 i need serious help on thanks

4x+8 =- 4

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I have to solve each system by the addition method, and if a unique solution does not exist, state whether the system is inconsistent or dependent. I have no clue how to do these a a water tank in the shape of a cone holds 100 cubic feet of water and has a diameter of 6 feet. estimate its height