exam Maths Puzzle Numerical Ability

Asking for help on factoring this
9x(x-7y)-6(x-7y)
thanks ahead of time, I appreciate the help

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exam Other Question

The reciprocal of a number plus the reciprocal of twice the number equals 3/10. Find the number. Solve by quadratic Equation.
3x^2-6x+2=0

Please explain.