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7.2-x/3 = 2.1 // - 2.1
7.2-x/3-2.1 = 0
5.1-1/3*x = 0 // - 5.1
-1/3*x = -5.1 // : -1/3
x = -5.1/(-1/3)
x = 15.30000015
x = 15.30000015
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