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a in (-oo:+oo)
7-5*a = (-2/7)*a+65/14 // - (-2/7)*a+65/14
7-5*a-((-2/7)*a)-(65/14) = 0
(2/7)*a-5*a-65/14+7 = 0
33/14-33/7*a = 0 // - 33/14
-33/7*a = -33/14 // : -33/7
a = -33/14/(-33/7)
a = 1/2
a = 1/2
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