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21-((2*x)/3) = 5 // - 5
21-((2*x)/3)-5 = 0
(-2/3)*x-5+21 = 0
16-2/3*x = 0 // - 16
-2/3*x = -16 // : -2/3
x = -16/(-2/3)
x = 24
x = 24
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