39+х39 + х39+х - 84 = 78
39 + х - 84 = 78
х = 78 - 39 + 84;
х = 123
х−83х - 83х−83 + 316 = 425
х - 83 + 316 = 425
х = 425 + 83 - 316
х = 192
39+х39 + х39+х - 84 = 78
39 + х - 84 = 78
х = 78 - 39 + 84;
х = 123
х−83х - 83х−83 + 316 = 425
х - 83 + 316 = 425
х = 425 + 83 - 316
х = 192