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(2*a)/7-(25/7) = (-3*a)/7 // - (-3*a)/7
(2*a)/7-((-3*a)/7)-(25/7) = 0
(2*a)/7+(3/7)*a-25/7 = 0
5/7*a-25/7 = 0 // + 25/7
5/7*a = 25/7 // : 5/7
a = 25/7/5/7
a = 5
a = 5
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