A system does $2\mathrm{.}60{10}^{8}J$ of work while $6\mathrm{.}70{10}^{8}J$ of heat transfer occurs to the environment. What is the change in internal energy $($in J$)$ of the system assuming no other changes $($such as in temperature or by the addition of fuel$)?($Include the sign of the value in your answer.$)$

$$

J

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