2 - 2x+3=7, 5x - 3x+2x, 5 - 4x=20, 7 - x+5=12, 4 - 4x-7=9, 3 - 3(2x-1)=15, (x+2)(x+3) - x^2+5x+6, 13 - x-4=9, 12 - x+8=20, (x+2)(x+5) - x^2+7x+10,

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