book Maths Puzzle Numerical Ability

Simplify (b^c + 7bc - 3) - (12b^c - 2bc + 5) Thanks

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I am having trouble simplifying. I know it sounds silly but I have never seen this one or dont remember it. I thought that expanding the problem and elimination would be the answe If y = -38 and y = 24 + 8x, what is the value of X?