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# Large equations system in Wolfram Alpha is not understood

Posted 10 years ago
 Hi,I have this system, and some known and unknow variables. I want to express the latter with known ones. The WolframAlpha main page form has length limit reached   a bit before the end, so I've shortened the formula (rename variable), end then it says it does not understand.Can you help me on this ?The system: E=dec1+dec2 dec1=ec_1-ec1 ec1=(1/2)*m1*v1^2 ec_1=(1/2)*m1*v_1^2 dec2=ec_2-ec2 ec2=(1/2)*m2*v2^2 ec_2=(1/2)*m1*v_2^2 dv1=v_1-v1 dv2=v_2-v2m1*dv1=m2*dv2Known:m1,m2,E,v1,v2ec1, ec2trivial, considered known :ec_1, ec_2, dec1, dec2, v_1, v_2, dv1, dv2My 1st query, a bit too long:Solve[{m1*dv1=m2*dv2,E=dec1+dec2,dec1=ec_1-ec1,ec1=(1/2)*m1*v1^2,ec_1=(1/2)*m1*v_1^2,dec2=ec_2-ec2,ec2=(1/2)*m2*v2^2,ec_2=(1/2)*m1*v_2^2,dv1=v_1-v1,dv2=v_2-v2,m1*dv1=m2*dv2},{ec_1,ec_2,dec1,dec2,v_1,v_2,dv1,dv2}]The 2nd query: I replaced the "ec" by "k" in variable name.Solve[{m1*dv1=m2*dv2,E=dk1+dk2,dk1=k_1-k1,k1=(1/2)*m1*v1^2,k_1=(1/2)*m1*v_1^2,dk2=k_2-k2,k2=(1/2)*m2*v2^2,k_2=(1/2)*m1*v_2^2,dv1=v_1-v1,dv2=v_2-v2,m1*dv1=m2*dv2},{k_1,k_2,dk1,dk2,v_1,v_2,dv1,dv2}]But "Wolfram|Alpha doesn't understand your query". I've done it by hand, just wanted to see what Wolfram would answer. Thanks for any help.