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(-2/5)*x+2*x+5 = 83/15 // - 83/15
(-2/5)*x+2*x-(83/15)+5 = 0
(-2/5)*x+2*x-83/15+5 = 0
8/5*x-8/15 = 0 // + 8/15
8/5*x = 8/15 // : 8/5
x = 8/15/8/5
x = 1/3
x = 1/3
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