find one's again please..
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-3/4 ( -5/2 + 7/6) = -3/4*-5/2 + -3/4 * 7/6
15/8 - 21/24 = 15/8 - 21/24
we can see LHS = RHS already
(45-21)/24 = (45-21)/24
24/24 = 24/24
1 = 1
LHS = RHS
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