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a in (-oo:+oo)
2-(4*a) = 7*a+68 // - 7*a+68
2-(4*a)-(7*a)-68 = 0
2-4*a-7*a-68 = 0
-11*a-66 = 0 // + 66
-11*a = 66 // : -11
a = 66/(-11)
a = -6
a = -6
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