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x in (-oo:+oo)
3*x-(2/5) = x-9 // - x-9
3*x-x-(2/5)+9 = 0
3*x-x-2/5+9 = 0
2*x+43/5 = 0 // - 43/5
2*x = -43/5 // : 2
x = -43/5/2
x = -43/10
x = -43/10
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