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x in (-oo:+oo)
(7*x)/4 = 1.4 // - 1.4
(7*x)/4-1.4 = 0
7/4*x-1.4 = 0 // + 1.4
7/4*x = 1.4 // : 7/4
x = 1.4/7/4
x = 0.8
x = 0.8
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