Expand and simplify the following expression: x(5x – 2) – 3(x2 – 2x + 7)
5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21
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f(x)=2x+c, g(x)=cx+5, fg(x)=6x+d; c and d are constants. Work out the value of d