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-18.9+.38x=21+.17x
We move all terms to the left:
-18.9+.38x-(21+.17x)=0
We add all the numbers together, and all the variables
.38x-(.17x+21)-18.9=0
We get rid of parentheses
.38x-.17x-21-18.9=0
We add all the numbers together, and all the variables
0.21x-39.9=0
We move all terms containing x to the left, all other terms to the right
0.21x=39.9
x=39.9/0.21
x=190
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