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a in (-oo:+oo)
5*a-(2*a)+3 = 33 // - 33
5*a-(2*a)-33+3 = 0
5*a-2*a-33+3 = 0
3*a-30 = 0 // + 30
3*a = 30 // : 3
a = 30/3
a = 10
a = 10
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