4x - 2y = 5 y= 2x + 10
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We have the expression 
. To write a equivalent expression, we are going to rewrite the denominator of our expression using its common denominator 4:
Now, notice that we are basically diving 1 by
, so we have a division involving fractions, and remember that to divide fractions, we just need to invert the second fraction and multiply:
We can conclude that the equivalent expression of is 
.
Now, notice that we are basically diving 1 by
We can conclude that the equivalent expression of