a,b x 6 - a,b = 1a,b
a,b x ( 6 - 1 ) = 10 + a,b
a,b x 5 = 10 + a,b
a,b x 5 - a,b = 10
a,b x (5 - 1) = 10
a,b x 4 = 10
a,b = 10 : 4
a,b = 2,5
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