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Erythrosin17
We need to write the expression 3(x + y) = 2y - x in a verbal sentence. We do as follows:

Three times the sum of x and y is equal to two times y minus x.

or

The sum of x and y multiplied by three is equal to the difference of two y and x.

or 

Three quantity x plus y is equal to the product of two and y minus x.

or 

Three multiplied by the sum of x and y is equal to two times y minus x.

Either of the statements I have written above would be correct and would mean the same equation.

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