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The masses are colinear, so we can simply add them together. Assuming to the right is the positive direction, the 10N force is written +10N, then to the left is negative, so the other force is -2N.

The sum of the forces = +8N, or 8 N to the right. One newton is equal to kg*m/s2.

Acceleration is force / mass, or 8/4 or 2 m/s2 in the positive direction, or to the right.

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