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a in (-oo:+oo)
5*(7*a+8) = -100 // + 100
5*(7*a+8)+100 = 0
5*(7*a+8)+100 = 0
35*a+140 = 0
35*a+140 = 0
35*a+140 = 0 // - 140
35*a = -140 // : 35
a = -140/35
a = -4
a = -4
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