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a in (-oo:+oo)
7*a+4*a-6 = -7/3 // + -7/3
7*a+4*a-(-7/3)-6 = 0
7*a+4*a+7/3-6 = 0
11*a-11/3 = 0 // + 11/3
11*a = 11/3 // : 11
a = 11/3/11
a = 1/3
a = 1/3
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