Show that a,b,c,d are in proportion if (a+b+c+d)(a_b_c+d)=(a+b_c_d)(a_b+c_d)​

Show that a,b,c,d are in proportion if (a+b+c+d)(a_b_c+d)=(a+b_c_d)(a_b+c_d)​

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