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x in (-oo:+oo)
3.5*x = 7/10 // - 7/10
3.5*x-(7/10) = 0
3.5*x-7/10 = 0
3.5*x-7/10 = 0 // + 7/10
3.5*x = 7/10 // : 3.5
x = 7/10/3.5
x = 0.2
x = 0.2
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