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x in (-oo:+oo)
3*x+7/10 = -53/10 // + -53/10
3*x+7/10-(-53/10) = 0
3*x+7/10+53/10 = 0
3*x+6 = 0 // - 6
3*x = -6 // : 3
x = -6/3
x = -2
x = -2
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