book Maths Puzzle Numerical Ability

can you please solve this equation:12x-24=-14x+28

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Can you please help me with this question
The slope of a line is -2. Through which pairs of points could the line pass?
1.(0,3)and(-2,7)
2.(0,-1)and(2,-5)
3.(0,0)and(3,6)
4.(2,-3)and(-1,3)
Thanks What is the linear system of 2x+y=2,2x+3y=13 using substitution?