2(y + 3) = 21 - 3y
2y + 6 = 21 - 3y
2y + 3y = 21 - 6
5y = 15
y = 15 / 5
y = 3
Ответ: y = 3
-3(1 - 3d) - 12 = 12
-3 + 9d - 12 = 12
9d - 15 = 12
9d = 12 + 15
9d = 27
d = 27 / 9
d = 3
Ответ: d = 3
5(2 - 2x) = 2(x - 3) + 4
10 - 10x = 2x - 6 + 4
10 - 10x = 2x - 2
-10x - 2x = -2 - 10
-12x = -12
x = -12 / -12
x = 1
Ответ: x = 1
0,88 - (5,12 + 0,08y) = 4,92y - y
0,88 - 5,12 - 0,08y = 3,92y
-4,24 - 0,08y = 3,92y
-4,24 = 3,92y + 0,08y
-4,24 = 4y
y = -4,24 / 4
y = -1,06
Ответ: y = -1,06