8x-3=15x+18
a. x=-3
b. x=3
c. x=2.1
d. x=0.9

8x - 3 = 15x + 18

First, subtract 8x from both sides. / Your problem should look like: 
Second, simplify 15x + 18 - 8x to 7x + 18. / Your problem should look like: 
Third, subtract 18 from both sides. / Your problem should look like: 
Fourth, subtract -3 - 18 to get -21. / Your problem should look like: 
Fifth, divide both sides by 7. / Your problem should look like: = x
Sixth, simplify  to 3. / Your problem should look like: 
Seventh, switch sides. / Your problem should look like: 

 x = -3