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(2/5)*x-3 = -3/5 // + -3/5
(2/5)*x-(-3/5)-3 = 0
(2/5)*x+3/5-3 = 0
2/5*x-12/5 = 0 // + 12/5
2/5*x = 12/5 // : 2/5
x = 12/5/2/5
x = 6
x = 6
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