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x in (-oo:+oo)
(3/7)*x = -0.42 // + 0.42
(3/7)*x+0.42 = 0
3/7*x+0.42 = 0 // - 0.42
3/7*x = -0.42 // : 3/7
x = -0.42/3/7
x = -0.98
x = -0.98
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