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a in (-oo:+oo)
(-5/7)*a = -2/7 // + -2/7
(-5/7)*a-(-2/7) = 0
(-5/7)*a+2/7 = 0
2/7-5/7*a = 0 // - 2/7
-5/7*a = -2/7 // : -5/7
a = -2/7/(-5/7)
a = 2/5
a = 2/5
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