exam Maths Puzzle Numerical Ability

What would the answer be for 12+2(k+3)=3k-6?
Could you please show the work so i can understand it.

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exam Other Question

can you please help me indicate if the following set of lines is parallel, perpendicular, or neither. (((y= 2x-5 y= 2x+5))) I typed my problem incorrectly
It is
3x squared +x-5