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(7/3)*x = 21/10 // - 21/10
(7/3)*x-(21/10) = 0
(7/3)*x-21/10 = 0
7/3*x-21/10 = 0 // + 21/10
7/3*x = 21/10 // : 7/3
x = 21/10/7/3
x = 9/10
x = 9/10
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