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simplify 2(y + 3)^2 - 3(z + 2x)^2 + 4(2z - x)(z + 2x) - 12(y + 3) + 15
simplify 2(y + 3)^2 - 3(z + 2x)^2 + 4(2z - x)(z + 2x) - 12(y + 3) + 15
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