c: \(7\left(3x-2\right)-15\left(x-2\right)+10\)
\(=21x-14-15x+30+10\)
=6x+26
d: \(\left(x-1\right)\left(x+3\right)+2x\left(x-3\right)+1\)
\(=x^2+2x-3+2x^2-6x+1\)
\(=3x^2-4x-2\)
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