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24-09-2018
Mathematics

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Аноним Аноним

24-09-2018

It is convenient to simplify the expression first:

[tex] 5x-2y+7x-y = 12x-3y [/tex]

Now let's plug the values: we substitute x = 7 and y = -2:

[tex] 12x-3y = 12\cdot 7 - 3 \cdot (-2) = 84 + 6 = 90[/tex]

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