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x in (-oo:+oo)
((1*2)/7)*x = -3 // + 3
((1*2)/7)*x+3 = 0
(2/7)*x+3 = 0
2/7*x+3 = 0 // - 3
2/7*x = -3 // : 2/7
x = -3/2/7
x = -21/2
x = -21/2
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