(80x + 240) : 180 = 4
80x + 240 = 4 * 180
80x + 240 = 720
80x = 720 - 240
80x = 480
x = 480 : 80
x = 6
Ответ: x = 6
500 - 360 : (y − 4) = 460
360 : (y − 4) = 500 - 460
360 : (y − 4) = 40
y − 4 = 360 : 40
y − 4 = 9
y = 9 + 4
y = 13
Ответ: y = 13
8t - 3t + 5t = 70
10t = 70
t = 70 : 10
t = 7
Ответ: t = 7
n + 4n - 3n = 52
2n = 52
n = 52 : 2
n = 26
Ответ: n = 26