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a in (-oo:+oo)
4*a-10 = -5*a-64 // + -5*a-64
4*a-(-5*a)-10+64 = 0
4*a+5*a-10+64 = 0
9*a+54 = 0 // - 54
9*a = -54 // : 9
a = -54/9
a = -6
a = -6
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