Пошаговое объяснение:
(x + 340) - 152 = 214
x + 340 = 214 + 152
x + 340 = 366
x = 366 - 340
x = 26
500 + (x + 140) = 2056
x + 140 = 2056 - 500
x + 140 = 1556
x = 1556 - 140
x = 1416
800 : y - 300 = 500
800 : y = 500+300
800 : y = 800
y = 800 : 800
y = 1
(a + 200) : 400 = 2
a + 200 = 2*400
a + 200 = 800
a = 800 - 200
a = 600
