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a in (-oo:+oo)
7*a-(4*a)+1 = -32 // + 32
7*a-(4*a)+1+32 = 0
7*a-4*a+1+32 = 0
3*a+33 = 0 // - 33
3*a = -33 // : 3
a = -33/3
a = -11
a = -11
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