exam Maths Puzzle Numerical Ability

7(3-x)+1=5x-2
21-7x+1=5x-2
24=12x
24/12=2
12x/12=x
x=2

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exam Other Question

Please help. I am not sure how to do this.
Write the equation of the line passing through each of the given pairs of points. Write your result in slope-intercept form, where possible.
(2,-3) and (2, 4) (7-2x)subtracted from (11-2x).