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x in (-oo:+oo)
3/8-3*x = -13/8 // + -13/8
3/8-3*x-(-13/8) = 0
3/8-3*x+13/8 = 0
2-3*x = 0 // - 2
-3*x = -2 // : -3
x = -2/(-3)
x = 2/3
x = 2/3
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