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x+(2/5)*x-3 = -99/5 // + -99/5
x+(2/5)*x-(-99/5)-3 = 0
x+(2/5)*x+99/5-3 = 0
7/5*x+84/5 = 0 // - 84/5
7/5*x = -84/5 // : 7/5
x = -84/5/7/5
x = -12
x = -12
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