book Maths Puzzle Numerical Ability

how do you define a statement that have two expressions and the same value
detemine whether 5 is a solution of 3x+2=x+12.

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book Other Question

x + 6 for x = 7 I am have a problem understanding how to change this equation in the slope-intercept form. Please Help ME. y+2/3=1/2(x-2/5) Can you explain how I go about doing this?

Thanks!!!