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x in (-oo:+oo)
5*x-(7/3) = 12 // - 12
5*x-(7/3)-12 = 0
5*x-7/3-12 = 0
5*x-43/3 = 0 // + 43/3
5*x = 43/3 // : 5
x = 43/3/5
x = 43/15
x = 43/15
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