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x in (-oo:+oo)
(-7/2)*x = -21/10 // + -21/10
(-7/2)*x-(-21/10) = 0
(-7/2)*x+21/10 = 0
21/10-7/2*x = 0 // - 21/10
-7/2*x = -21/10 // : -7/2
x = -21/10/(-7/2)
x = 3/5
x = 3/5
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