x+1=0 - x=-1, R-2=0 - R=2, x+1=-2 - x=-3, 2x=-4 - x=-2, a-20=11 - a=31, 4x+2=30 - x=7, 2x-4=8 - x=6, 7x+12=82 - x=10, 2x-7=1 - x=4, 3x-1=8 - x=3,

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