book Maths Puzzle Numerical Ability

7y+7x=21x+35 slove for y

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book Other Question

jumping rope can burn 600 calories per hour; write and solve an inequality to find the number of hours of jumping rope that it would take for you to burn at least 450 calories. I am a beginner.

I am stuck on correct answer for finding one of the factors of:

X^2 + X - 6 =

I am not using a specific book. I am just practicing...........