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a in (-oo:+oo)
-33 = a-5*a+7 // - a-5*a+7
-(-5*a)-a-33-7 = 0
5*a-a-33-7 = 0
4*a-40 = 0 // + 40
4*a = 40 // : 4
a = 40/4
a = 10
a = 10
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