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a in (-oo:+oo)
(-4/7)*(a-(1/4)) = 3/7 // - 3/7
(-4/7)*(a-(1/4))-(3/7) = 0
(-4/7)*(a-1/4)-3/7 = 0
-4/7*(a-1/4)-3/7 = 0
(-4/7*7*(a-1/4))/7-3/7 = 0
-4/7*7*(a-1/4)-3 = 0
-4*a-2 = 0
(-4*a-2)/7 = 0
(-4*a-2)/7 = 0 // * 7
-4*a-2 = 0
-4*a-2 = 0 // + 2
-4*a = 2 // : -4
a = 2/(-4)
a = -1/2
a = -1/2
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