book Maths Puzzle Numerical Ability

Please help me simplify the following expression by combining like terms....step by step instructions would be great!

3x(2x-3)+5(2x-3)


Thank you

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book Other Question

a five-digit perfect square in the form of 5abc6 has a thousands digit a, hundreds digit b, and tens digit c. if a< b< c, what is the sum of a+b+c? When is a solution set the entire set of real numbers?