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9900=x*1.15
We move all terms to the left:
9900-(x*1.15)=0
We add all the numbers together, and all the variables
-(+x*1.15)+9900=0
We get rid of parentheses
-x*1.15+9900=0
Wy multiply elements
-1.15x+9900=0
We move all terms containing x to the left, all other terms to the right
-1.15x=-9900
x=-9900/-1.15
x=8608+0.80000000000109/1.15
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