5(4a+3) - 20a+15, z(z+6) - 2z+6z, 4d+6d+1+1 - 10d+2, X+2y+x+2 - 2x+2y+2, 4y+z+7+4y+y - 9y+z+7, 2(7y+9x) - 14y+18x,

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