Expand (a/3+b/4) 3 -(a/3-b/4) 3
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= a/3×3 + b/4 ×3 - a/3 ×3 +b/4×3
= a + 3b/4 -a + 3b/4
= 3b/4 + 3b/4
= 6b/4
= 3b/2
= a + 3b/4 -a + 3b/4
= 3b/4 + 3b/4
= 6b/4
= 3b/2
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