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a in (-oo:+oo)
2*(4*a-10) = 36 // - 36
2*(4*a-10)-36 = 0
2*(4*a-10)-36 = 0
8*a-56 = 0
8*a-56 = 0
8*a-56 = 0 // + 56
8*a = 56 // : 8
a = 56/8
a = 7
a = 7
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