21/4x+9/8=2
pretend that 2 has a denominator which is 1. 2/1
move 9/8 to the other side
sign changes from +9/8 to -9/8
21/4x+9/8-9/8=2/1-9/8
21/4x=2/1-9/8
find the common denominator for 2/1 which is 8
multiply by 8 for 2/1=(2)(8)/(1)(8)=16/8
21/4x=16/8-9/8
21/4x=7/8
multiply both sides by 4/21 to get x by itself
21/4x *4/21= 7/8(4/21)
cross out 7 and 21, divide by 7
cross out 4 an 8, divide by 4
x=1/2*1/3
answer:
x=1/6
