The answer is x = 5. There is nothing to evaluate there!
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Take 3 and substitute into the expression given to you but not mentioned in the question here and evaluate the expression. "Sub and Solve" I say.
3 6
To evaluate the algebraic expression 7 + 5x for x = 10, you substitute the value of x into the expression. So, you get 7 + 5(10), which simplifies to 7 + 50. Therefore, the final answer is 57.
2x - 3y -7y + 4x - 5 = 6x - 10y - 5 and (6 x 10) - (10 x 4 ) - 5 = 60 - 40 - 5 = 15