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x in (-oo:+oo)
4*x-(3/3) = 7 // - 7
4*x-(3/3)-7 = 0
4*x-7-1 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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