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(3/5)*x+4/5 = -8/5 // + -8/5
(3/5)*x+4/5-(-8/5) = 0
(3/5)*x+4/5+8/5 = 0
3/5*x+12/5 = 0 // - 12/5
3/5*x = -12/5 // : 3/5
x = -12/5/3/5
x = -4
x = -4
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