exam Maths Puzzle Numerical Ability

hi! I need someone to check to make sure I did this problem correctly...
3(x-6)=(2x-7)4

Heres what I have
3x-18=8x-28
+28= +28
------------
3x+10=8x
-3x =-3x
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10=5x
2=x

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exam Other Question

identity:
tan2a+sin2a/2cos^2a=
=2sinacosa/2cos^2a
=2sina+sqr1-cos^2a/2cos^2a
=????

ans:
1. sin1+cos2a
2. tan2a
3. cos^2a-sin^2a
4. cot2a
5. 0
If a bag contains 15 marbles, how many samples of 2 marbles can be drawn from it? How many samples of 2 can be drawn in which both marbles are blue?