3a - 2/3 - 2a + 3/2 = a +7/6
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3a-2/3-2a+3/2=a+7/6
=>a-2/3+3/2=a+7/6
=>3/2-2/3=7/6
=>9-4/6=7/6
=>5/6=7/6
=>7/6-5/6=2/6=1/3
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