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a in (-oo:+oo)
5*a-10 = 90-5*a // - 90-5*a
5*a-(-5*a)-90-10 = 0
5*a+5*a-90-10 = 0
10*a-100 = 0 // + 100
10*a = 100 // : 10
a = 100/10
a = 10
a = 10
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