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x in (-oo:+oo)
3*x = 7/10 // - 7/10
3*x-(7/10) = 0
3*x-7/10 = 0
3*x-7/10 = 0 // + 7/10
3*x = 7/10 // : 3
x = 7/10/3
x = 7/30
x = 7/30
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