1,5x-0.5x=30-27
2.5x=3
x=1.2
2,100-32-12x=200
68-12x=200
12x=68-200
12x=﹣132
x=-11
3,3.5x-1.2=2.7x+3
3.5x-2.7x=3+1.2
0.8x=4.2
x=5.25
4,7x+28=4-2x+12x-6
7x+2x-12x=﹣2﹣28
9x-12x=﹣30
﹣3x=-30
x=10
1,5x-0.5x=30-27
2.5x=3
x=1.2
2,100-32-12x=200
68-12x=200
12x=68-200
12x=﹣132
x=-11
3,3.5x-1.2=2.7x+3
3.5x-2.7x=3+1.2
0.8x=4.2
x=5.25
4,7x+28=4-2x+12x-6
7x+2x-12x=﹣2﹣28
9x-12x=﹣30
﹣3x=-30
x=10