Answer :
First, rearrange the equation to put the x's on one side:
.15=.5x+.9
Then put all of the constants on the other side of the equation:
-.75=.5x
Then divide both sides by .5
-1.5=x
.15=.5x+.9
Then put all of the constants on the other side of the equation:
-.75=.5x
Then divide both sides by .5
-1.5=x