exam Maths Puzzle Numerical Ability

Solve the equation

(y - 7) - (y + 6) =9y

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exam Other Question

find the slope of the line that goes through tht following points...thanks

(-4, 6), (-8, 6) Can you verify my answer please?

Multiply
√7(2√3+3√7)
I got 2√21+21 is this correct?

Thanks for your help!