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x in (-oo:+oo)
1.9/4 = x/7 // - x/7
1.9/4-(x/7) = 0
0.475-1/7*x = 0 // - 0.475
-1/7*x = -0.475 // : -1/7
x = -0.475/(-1/7)
x = 3.32500007
x = 3.32500007
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