Answer :

Given the following equation:

[tex]5x+10y=-3[/tex]

You know, based on the information given in the exercise, that it is a true equation. You can notice that the sum (the result of the Addition) of the terms on the left side of the equation, is:

[tex]-3[/tex]

Then, knowing the above and having the following expression:

[tex]5x+10y+7[/tex]

You can substitute the sum of the equation into the expression:

[tex](5x+10y)+7=-3+7[/tex]

Finally, adding the numbers, you get that the value of the expression is:

[tex]=4[/tex]

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