$$3 a + \frac { 7 } { 2 } = \frac { 3 a } { 2 } + 5$$
$a=1$
$$6a+7=3a+10$$
$$6a+7-3a=10$$
$$3a+7=10$$
$$3a=10-7$$
$$3a=3$$
$$a=\frac{3}{3}$$
$$a=1$$
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