book Maths Puzzle Numerical Ability

SIMPLIFY EACH EXPRESSION.
12a-a

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book Other Question

Let a1, a2, a3,.......an,....be an arithmetic sequence. Find the indicated quatitties. Could someone please help me with this? a1=-11,d=4;a2=?,a3=?a4=?
Thank you! Because I've missed a step somewher I'm lost. Please show me the steps to solve for:

3x+4y-3z=5
x+6y+2z=3
6x+2y+3z=4

Thank You