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