solve 7+ 2 ( a + 1 ) - 3 a = 5 a
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7+2(a+1)−3a=5a
⇒ 7+2a+2−3a=5a
⇒ 9−a−5a=0
⇒ 9−6a=0
⇒ 6a=9
⇒ a=
∴ a=
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