3(4x-8)=3x-6
раскроем скобки
12x-24 = 3x-6
9x-18 = 0
9x = 18
x = 2
1-5(1.5+a)=6-7.5a
1-7.5-5a = 6-7.5a
2.5a-12.5 = 0
2.5a = 12.5
a = 5
3(5-x)+13=4(3x-8)
15-3x+13 = 12x-32
-15x+60 = 0
15x-60 = 0
15x = 60
x = 4
3(4x-8)=3x-6
раскроем скобки
12x-24 = 3x-6
9x-18 = 0
9x = 18
x = 2
1-5(1.5+a)=6-7.5a
раскроем скобки
1-7.5-5a = 6-7.5a
2.5a-12.5 = 0
2.5a = 12.5
a = 5
3(5-x)+13=4(3x-8)
раскроем скобки
15-3x+13 = 12x-32
-15x+60 = 0
15x-60 = 0
15x = 60
x = 4