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x in (-oo:+oo)
(-7/5)*x = -21/25 // + -21/25
(-7/5)*x-(-21/25) = 0
(-7/5)*x+21/25 = 0
21/25-7/5*x = 0 // - 21/25
-7/5*x = -21/25 // : -7/5
x = -21/25/(-7/5)
x = 3/5
x = 3/5
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