a+(3a-2a)-(4a-3b)
Combine the "a" tems and you can reduce this to _?_a + 3b.
You do the math.
a + (3a-2a)-(4a-3b)
=
a + 3a - 2a -4a +3b
= -2a + 3b
Combine the "a" tems and you can reduce this to _?_a + 3b.
You do the math.
=
a + 3a - 2a -4a +3b
= -2a + 3b