1) 17 + 3(2x + 24) = 107
3(2x + 24) = 107 - 17
3(2x + 24) = 90
2x + 24 = 90 : 3
2x + 24 = 30
2x = 30 - 24
2x = 6
x = 6 : 2
x = 3
2) 2(15 + 3x) + 124 = 178
2(15 + 3x) = 178 - 124
2(15 + 3x) = 54
15 + 3x = 54 : 2
15 + 3x = 27
3x = 27 - 15
3x = 12
x = 12 : 3
x = 4
3) 27 + 3(17 - 4x) = 54
3(17 - 4x) = 54 - 27
3(17 - 4x) = 27
17 - 4x = 27 : 3
17 - 4x = 9
4x = 17 - 9
4x = 8
x = 8 : 4
x = 2
10) 4.(53 - 5x) - 52 = 80
4.(53 - 5x) = 80 + 52
4(53 - 5x) = 132
53 - 5x = 132 : 4
53 - 5x = 33
5x = 53 - 33
5x = 20
x = 20 : 5
x = 4
11) 119 - 3.(7x - 4) = 47
3.(7x - 4) = 119 - 47
3(7x - 4) = 72
7x - 4 = 72 : 3
7x - 4 = 24
7x = 24 + 4
7x = 28
x = 28 : 7
x = 4
12) 2.(11x - 42) - 18 = 8
2.(11x - 42) = 8 + 18
2.(11x - 42) = 26
11x - 42 = 26 : 2
11x - 42 = 13
11x = 13 + 42
11x = 55
x = 55 : 11
x = 5
