1.320+x=650 2.x+87=587 3.780+x=800 4.840-x=310
x=650-320 x=587-87 x=800-780 x=840-310
x=330 x=500 x=20 x=530
320+330=650 500+87=587 780+20=800 840-530=310
5.x-330=560 6.350-x=50
x=560+330 x=350-50
x=890 x=300
890-330=560 350-300=50
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1.320+x=650 2.x+87=587 3.780+x=800 4.840-x=310
x=650-320 x=587-87 x=800-780 x=840-310
x=330 x=500 x=20 x=530
320+330=650 500+87=587 780+20=800 840-530=310
5.x-330=560 6.350-x=50
x=560+330 x=350-50
x=890 x=300
890-330=560 350-300=50