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a in (-oo:+oo)
(-5/7)*a-7 = -64/7 // + -64/7
(-5/7)*a-(-64/7)-7 = 0
(-5/7)*a+64/7-7 = 0
15/7-5/7*a = 0 // - 15/7
-5/7*a = -15/7 // : -5/7
a = -15/7/(-5/7)
a = 3
a = 3
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