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(2/5)*x-(1/3) = 7 // - 7
(2/5)*x-(1/3)-7 = 0
(2/5)*x-1/3-7 = 0
2/5*x-22/3 = 0 // + 22/3
2/5*x = 22/3 // : 2/5
x = 22/3/2/5
x = 55/3
x = 55/3
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