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x+(x*0.18)=12900
We move all terms to the left:
x+(x*0.18)-(12900)=0
We add all the numbers together, and all the variables
x+(+x*0.18)-12900=0
We get rid of parentheses
x+x*0.18-12900=0
Wy multiply elements
x+0.18x-12900=0
We add all the numbers together, and all the variables
1.18x-12900=0
We move all terms containing x to the left, all other terms to the right
1.18x=12900
x=12900/1.18
x=10932+0.23999999999978/1.18
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