A barrel of diesel oil weighs 120 kg. After 0.75% of the oil is poured out, the remaining oil weighs 45 kg. How many kg does this barrel of diesel oil weigh? Use the equation to solve

Suppose this barrel of diesel oil weighs x kg
120－0.75x＝45
0.75x＝120－45
0.75x＝75
x＝100

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