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a in (-oo:+oo)
(-1/2)*a+7 = (6/7)*a+324/49 // - (6/7)*a+324/49
(-1/2)*a-((6/7)*a)-(324/49)+7 = 0
(-1/2)*a+(-6/7)*a-324/49+7 = 0
19/49-19/14*a = 0 // - 19/49
-19/14*a = -19/49 // : -19/14
a = -19/49/(-19/14)
a = 2/7
a = 2/7
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