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a in (-oo:+oo)
5*(7*a+6) = 310 // - 310
5*(7*a+6)-310 = 0
5*(7*a+6)-310 = 0
35*a-280 = 0
35*a-280 = 0
35*a-280 = 0 // + 280
35*a = 280 // : 35
a = 280/35
a = 8
a = 8
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