x + x - 10 = 100 + 10
2x - 10 = 110
2x = 110 + 10
2x = 120
x = 60
x + x - 10 = 100 + 10
2x - 10 = 110
2x = 110 - 10
2x = 100
x = 50
x + x - 10 = 100 + 10
2 x x - 10 = 110
2 x x = 120
x = 60
k cho minh mot cai
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