4x+2(3-2x)=10, 4x+6-4x=10, x+6=10, x=4
2,700 / 12 = 225
225 / 5 = 45
They can make 45 necklaces.
5.6-4.9=x
.7= x is the answer not .8
12+6x was subtracted from the left but only 12 was subtracted from the right.
6x and 6 are not equal unless x=1
X=-11/15