-3 degrees celsius because -7 + 2 = -5, -5 + (-4) = -9, and -9 divided by 3 = -3.
<span><span><span><span><span><span><span><span><span><span><span><span><span><span><span>So your awnser is x=-15 and y=-14</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>