Given data:
Mass of block is,

Force -1 is,

Force-2 is,

Assume that, direction towrds right is +x direction and direction towrds left is -x direction.
Formula of acceleration is as follows:

Here,

Now,

Force-1 is negative. Because, direction of force-1 is towards left.
Hence,

Now, substitute known values in equation-(1),

Here, +ve sign indicates that direction of acceleration is towards right