\(6y : 12 = 82 - 78\)
\(6y : 12 = 4\)
\(6y = 4 \cdot 12\)
\(6y = 48\)
\(y = 48 : 6\)
\(y = 8\)
Проверка: \(78 + 6 \cdot 8 : 12 = 78 + 48 : 12 = 78 + 4 = 82\). Верно.
\(84 - 6x = 5 \cdot 12\)
\(84 - 6x = 60\)
\(84 - 60 = 6x\)
\(24 = 6x\)
\(x = 24 : 6\)
\(x = 4\)
Проверка: \((84 - 6 \cdot 4) : 12 = (84 - 24) : 12 = 60 : 12 = 5\). Верно.
\(75 : (39 - 12z) = 98 - 73\)
\(75 : (39 - 12z) = 25\)
\(39 - 12z = 75 : 25\)
\(39 - 12z = 3\)
\(39 - 3 = 12z\)
\(36 = 12z\)
\(z = 36 : 12\)
\(z = 3\)
Проверка: \(98 - 75 : (39 - 12 \cdot 3) = 98 - 75 : (39 - 36) = 98 - 75 : 3 = 98 - 25 = 73\). Верно.
\(236 : (52 - y) = 266 - 207\)
\(236 : (52 - y) = 59\)
\(52 - y = 236 : 59\)
\(52 - y = 4\)
\(52 - 4 = y\)
\(y = 48\)
Проверка: \(207 + 236 : (52 - 48) = 207 + 236 : 4 = 207 + 59 = 266\). Верно.
\(z : 5 + 12 = 64 : 4\)
\(z : 5 + 12 = 16\)
\(z : 5 = 16 - 12\)
\(z : 5 = 4\)
\(z = 4 \cdot 5\)
\(z = 20\)
Проверка: \(4 \cdot (20 : 5 + 12) = 4 \cdot (4 + 12) = 4 \cdot 16 = 64\). Верно.
\(x : 2 - 34 = 70 : 5\)
\(x : 2 - 34 = 14\)
\(x : 2 = 14 + 34\)
\(x : 2 = 48\)
\(x = 48 \cdot 2\)
\(x = 96\)
Проверка: \(5 \cdot (96 : 2 - 34) = 5 \cdot (48 - 34) = 5 \cdot 14 = 70\). Верно.
Ответ: y = 8, x = 4, z = 3, y = 48, z = 20, x = 96.