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a in (-oo:+oo)
(-2/7)*a = -1/35 // + -1/35
(-2/7)*a-(-1/35) = 0
(-2/7)*a+1/35 = 0
1/35-2/7*a = 0 // - 1/35
-2/7*a = -1/35 // : -2/7
a = -1/35/(-2/7)
a = 1/10
a = 1/10
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