6m+4n+?+6n=17m+10n, 3x+8y+?+5x+7x2+7x2=8x+8y+16x2, 3ab+6b+?-10b=5ab+4b, 3x+6y+2x-4y, 6m-17n+8n+7m-2n, 2x+6y+3x2+5x+5x2.

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