exercise1. 1/2y +3/2y - 5/6 exercise2. 3/4a +3 - 1/8a + 6
exercise1. 1/2y +3/2y - 5/6 = (1+3)/2y-5/6 = 4/2y+5/6 = 2y + 5/6
exercise2. 3/4a +3 - 1/8a + 6 = 3/4a - 1/8a +3+6 = 6/8a - 1/8a +3+6 = (6-1)/8a +9= 5/8a+9
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