Book Maths Puzzle Algebra

I'm having a problem solving 7x^2 = 84 or 7xsquared =84 thank you

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Book Other Question

The larger of two numbers is 8 more than four times the smaller. If the larger is increased by four times the smaller, the result is 40. Find the numbers. What is the slope of a line parallel to y=(1/3)x-4?