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a in (-oo:+oo)
(4/5)*a-(3*a)+7 = 29 // - 29
(4/5)*a-(3*a)-29+7 = 0
(4/5)*a-3*a-29+7 = 0
-11/5*a-22 = 0 // + 22
-11/5*a = 22 // : -11/5
a = 22/(-11/5)
a = -10
a = -10
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