Solve the following:
(a) $2 a + 4 = a + 5$ then $a =$ ___
(b) $4 x = 3 x + 7$ then $x =$ _
(c) $5 x + 3 = 4 x + 8$ then $x =$ _
(d) $3 b = 6$ then $b =$ _
(e) $2 x - 5 = x - 9$ then $x =$ ___

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Solution

(a)
$2 a + 4 = a + 5$
$a = 1$
(b)
$4 x = 3 x + 7$
$x = 7$
(c)
$5 x + 3 = 4 x + 8$
$x = 5$
(d)
$3 b = 6$
$b = 2$
(e)
$2 x - 5 = x - 9$
$x = - 4$

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