ta co: x+120-210+111+x=1002
2x+120-210+111=10000
2x=10000-111+210-120
2x=9979
x=9979:2
x=4989,5
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ta co: x+120-210+111+x=1002
2x+120-210+111=10000
2x=10000-111+210-120
2x=9979
x=9979:2
x=4989,5