I need to find the specific heat of copper using this formula - mass(specific heat)(change in temperature) + (mass)(specific heat)(change in temperature)=0

the mass of water is .1kg sh is 4180 j/kg temperature change - 2 for copper the numbers are mass .018 kg sh- need to find temp change- 76 for my answer i get .611 but it needs to be around .386 and i don't know what i'm doing wrong! please help!

thanks for your help! maybe when we did the experiment we wrote down the wrong results! i'm not sure because those are my numbers. i appreciate the help!