14+7y+3y=64 39+15a-12=12

Question

14+7y+3y=64
39+15a-12=12

Answer 1

14 + 7У + 3У = 64; 14 + 10У = 64; 10У = 64 - 14; ; 10У = 50; У = 50:10; У = 5........ 39 + 15а - 12 = 12; 27 + 15а = 12; 15а = 12 - 27; 15а = - 15; а = -15 : 15; а = -1.