6АВ=10(АВ-8)
6АВ=10АВ-80
6АВ-10АВ=-80
-4АВ=-80
АВ=20
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6АВ=10(АВ-8)
6АВ=10АВ-80
6АВ-10АВ=-80
-4АВ=-80
АВ=20