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0.28x=100-x
We move all terms to the left:
0.28x-(100-x)=0
We add all the numbers together, and all the variables
0.28x-(-1x+100)=0
We get rid of parentheses
0.28x+1x-100=0
We add all the numbers together, and all the variables
1.28x-100=0
We move all terms containing x to the left, all other terms to the right
1.28x=100
x=100/1.28
x=78+0.16/1.28
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