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( 35 - 5 ) : ( 6 - 1 ) = 6
_______________
b).
( 25 + 15 ) : ( 5 - 1 ) = 10
a + 5b = 35
5 + 5b = 35
b = 6
B). a = -15
a + 4b = 25
-15 + 4b = 25
b = 10