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x in (-oo:+oo)
5*x-(9/3) = 7 // - 7
5*x-(9/3)-7 = 0
5*x-7-3 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x = 2
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