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a in (-oo:+oo)
4*(5*a+7) = 208 // - 208
4*(5*a+7)-208 = 0
4*(5*a+7)-208 = 0
20*a-180 = 0
20*a-180 = 0
20*a-180 = 0 // + 180
20*a = 180 // : 20
a = 180/20
a = 9
a = 9
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