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a in (-oo:+oo)
a/5-(a/2) = 7 // - 7
a/5-(a/2)-7 = 0
-3/10*a-7 = 0 // + 7
-3/10*a = 7 // : -3/10
a = 7/(-3/10)
a = -70/3
a = -70/3
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