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Example:

y=2x+5 use are suppose to change the "y position" into x position.

x=2y+5 then it's already changed, so Y is required to find its value?

2y=x-5 transposition of constant no.5

2y/2=x-5 to find your Y isolate it by dividing both side by 2 to remove our constant.

y=x-5/2 This the final answer or the value of y in a given question.