exam Maths Puzzle Numerical Ability

i need help with (2k+1)7. this is distributive property. its usually a number in front of the parenthesis but for this particular problem there is not so i am really confused

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exam Other Question

1. How are addition and multiplication used to solve a linear equation? Demonstrate by solving "15x + 7 = 31 + 3x"

2. Translate the following into a system of equations, th find any rational roots for the equation: x^4 + 3x^3 - x^2 - 9x - 6 = 0