7X+5=12  , 3-2x=-7, 6 + 12-a=12, -14-k=-15, 2a+10=20, 5+x-16=4, 5x+17=27, 20+x=31, 12-6x=0, 15+2x=25, x-8=-4, X-7=4, 2 X-4=16, 1-k=1, 8k+8=8.

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