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a in (-oo:+oo)
4*(-(6*a)-1) = 284 // - 284
4*(-(6*a)-1)-284 = 0
4*(-6*a-1)-284 = 0
4*(-6*a-1)-284 = 0
-24*a-288 = 0
-24*a-288 = 0
-24*a-288 = 0 // + 288
-24*a = 288 // : -24
a = 288/(-24)
a = -12
a = -12
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