book Maths Puzzle Numerical Ability

Explain why -2 is not the solution of the equation 4x + 3x -5 = 27.

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book Other Question

Use the formula for simple interest, I - prt, over t years, to find I when p = $5000, r = 8.25%, and t = 5 years. how would i work this problem out :3x-y=1