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a in (-oo:+oo)
3*a+7/10 = 37/10 // - 37/10
3*a+7/10-(37/10) = 0
3*a+7/10-37/10 = 0
3*a-3 = 0 // + 3
3*a = 3 // : 3
a = 3/3
a = 1
a = 1
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