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x in (-oo:+oo)
0.2*x-(2/5) = 1 // - 1
0.2*x-(2/5)-1 = 0
0.2*x-2/5-1 = 0
0.2*x-7/5 = 0 // + 7/5
0.2*x = 7/5 // : 0.2
x = 7/5/0.2
x = 7
x = 7
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