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x in (-oo:+oo)
(-7/2)*x = -2 // + 2
(-7/2)*x+2 = 0
2-7/2*x = 0 // - 2
-7/2*x = -2 // : -7/2
x = -2/(-7/2)
x = 4/7
x = 4/7
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