11)
4x= 7*2
4x = 14
x = 14:4
x = 3,5
12)
3*(x+3)=12*4
3x + 9 = 48
3x = 48-9
3x = 39
x = 39:3
x = 13
14)
0,6x - 0,4x = 9 - 6
0,2x = 3
x = 3 : 0,2
x = 15
16)
x + 1 2/3 = -1,2 : 0,6
x + 1 2/3 = -2
x = -2 - 1 2/3
x = -3 2/3
17)
x + 9 3/11 = -68 : (-3,4)
x + 9 3/11 = 20
x = 20 - 9 3/11
x = 10 8/11
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Answers & Comments
x=(7*2)/4
x=14/4
x=3,5
12) x+3=(4*12)/3
x+3=48/3
x+3=16
x=16-3
x=13
14)0,4x-6=0,6x-9
0,6x-0,4x=9-6
0,2x=3
x=3/0,2
x=15
16)x+1 2/3=-1,2/0,6
x+1 2/3=-2
x=-2-1 2/3
x=-3 2/3
17)x+9 3/11=-68/-3,4
x+9 3/11=20
x=20-9 3/11
x=10 8/11
Verified answer
11)
4x= 7*2
4x = 14
x = 14:4
x = 3,5
12)
3*(x+3)=12*4
3x + 9 = 48
3x = 48-9
3x = 39
x = 39:3
x = 13
14)
0,6x - 0,4x = 9 - 6
0,2x = 3
x = 3 : 0,2
x = 15
16)
x + 1 2/3 = -1,2 : 0,6
x + 1 2/3 = -2
x = -2 - 1 2/3
x = -3 2/3
17)
x + 9 3/11 = -68 : (-3,4)
x + 9 3/11 = 20
x = 20 - 9 3/11
x = 10 8/11