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5a+5b-b+a/2 = 6a+4b/2 = 3a+2b
8a - 4( 1-a)/4 =
8a-4-4a / 4 = 4a-4/4=a-1
2(a + b - 1) - (a-b) / 3 =
2a+2b-2-a+b/3=a+3b-2/3= 1/3a+b-2/3