x=4, 2x=8, x=13, x-9=4, x=6, 3x=18, x=10, x-7=3, x=3, 2x+3=9, x=7, 3x-2(x-5)=12, x=11, x-3=8, x=9, x+6=15, x=2, 3x-2(x-4)=10, x=5, 4x=20.

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