exam Maths Puzzle Numerical Ability

Solve the linear equations:

A + B + C = 0
4A - 10B = 3
-10B + 5C = 6

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Given f(x)= 3x+3, find f(a+1). How do I solve?

The additive inverse of a number divided by 12 is the same as one less than 3 times its reciprocal. Find the number.